数学题初一下册?一、选择题(每小题4分,共40分). 1.A; 2.B; 3.A; 4.C; 5.B; 6.D; 7.D; 8.C; 9.C; 10.B. 二、填空题(每小题4分,共24分). 11、2; 12、 ; 13、 ; 14、 ; 15、六; 16、60. 三、那么,数学题初一下册?一起来了解一下吧。
5.4÷1.8+240×1.5
=3+360
=3639000÷72×(1.25×0.7×8)
=9000÷72×7
=125×7
=87561-(1.25+2.5×0.7)
=61-3
=58[(10-0.8)+9.85]-2÷0.125
=19.05-2÷0.125
=19.05-16
=3.05
08-12×24
=
408
-
288
=
120(46+28)×60
=
74
x
60
=
444042×50-17
=
2100-
17
=
208332+105÷5
=
32
+
21
=
53420×(327-238)
=
420
x
89
=
37380(4121+2389)÷7
=
6510
÷7
=
9303.416÷(0.016×35)
=
3.416
÷0.56
=
6.10.8×[(10-6.76)÷1.2]
=
0.8
x(3.24÷1.2)
=
0.8
x
2.7
=
2.165.67×0.2-0.62
=
1.134-0.62
=
0.5140.4×0.7×0.25
=
0.4
x
0.25
x
0.7
=
0.1
x
0.7
=
0.070.78+5.436+1
=
6.216
+1
=
7.21630.8÷[14-(9.85+1.07)]
=
30.8
÷
(14
-
10.92)
=
30.8÷3.08
=
10[60-(9.5+28.9)]÷0.18
=
(60-
38.4)÷0.18
=
21.6
÷0.18
=
1202.881÷0.43-0.24×3.5
=
6.7
-
0.24
x3.5
=
6.7
-
0.84
=
5.8620×[(2.44-1.8)÷0.4+0.15]
=
20x
(0.64
÷0.4
+0.15)=
20x(1.6
+0.15)
=
20
x1.75
=
3528-(3.4+1.25×2.4)
=
28
-
(3.4
+
3)
=
28
-
6.4
=
21.62.55×7.1+2.45×7.1
=
(2.55
+
2.45)
x7.1
=
5
x7.1=35.50.8×〔15.5-(3.21+5.79)〕
=
0.8
x
(15.5
-
9)
=
0.8
x
6.5
=
5.2(31.8+3.2×4)÷5
=
(31.8
+
12.8)÷5
=
44.6÷5
=
8.9231.5×4÷(6+3)
=
126
÷
9
=
142÷2.5+2.5÷2
=
0.8
+
1.25
=2.05194-64.8÷1.8×0.9
=
194
-36
x0.9
=
194-32.4
=
161.65180-705×6
=
5180
-
4230=95024÷2.4-2.5×0.8
=10
-2=8405×(3213-3189)
=405x24
=
9720125×(97-81)
=125x16
=20006942+480÷3
=
6942
+
160
=
678220+80÷4-20
=
20
+
20
-20
=
40
-20
=
20100÷(32-30)×0
=
100
÷2
x0=
50
x0
=
025×4-12×5
=
100
-
60
=
4070×〔肆猜(42-42)÷18〕裂滚型=70
x
(0÷18)
=
70x0
=
075×65+75×35
=
75
x
(65
+35)
=
75x100
=
7500
6-1.6÷4=
6-
0.4
=
5.65.38+7.85-5.37=
13.23
-
5.37=7.867.2÷0.8-1.2×5=9
-
6
=36-1.19×3-0.43=
6-3.57
-
0.43
=
6-
(3.57
+
0.43)
=
6-4
=
26.5×(备梁4.8-1.2×4)=
6.5
x(4.8
-
4.8
)=6.5
x0
=
00.68×1.9+0.32×1.9
=
(0.68
+
0.32)
x1.9
=
1
x
1.9
=
1.910.15-10.75×0.4-5.7
=
10.15
-
4.3
-
5.7
=
10.15
-(4.3
+
5.7)=10.15
-
10
=0.155.8×(3.87-0.13)+4.2×3.74
=
5.8
x
3.74
+4.2
x
3.74
=
(5.8
+4.2)x3.74
=
10
x
3.74
=
37.432.52-(6+9.728÷3.2)×2.5
=
32.52
-
(6+3.04)x2.5
=
32.52
-
9.02
x
2.5
=
32.52
-22.55
=
9.97(136+64)×(65-345÷23)=
200x(65-15)
=
200x
50=10000
(4+8)x125
=4x125+8x125
=500+1000
=1500
58x101-58
=58x(101-1)
=58x100
=5800
5600÷(56x25)
=5600÷56÷25
=100÷25
=4
269x5+269x99-4x269
=269x(5+99-4)
=269x100
=26900
147x19+81x147
=147x(19+81)
=147x100
=14700
(25+125)x80
=25x80+125x80
=2000+10000
=12000
120÷(3分之1-4分之1)
=120÷(12分之4-12分之3)
=120÷12分之1
=120×12
=1440
10.1×89-8.9
=101x8.9-8.9x1
=8.9x(101-1)
=8.9x100
=890
9.07-22.78÷3.4
=9.07-6.7
=9.07-(7-0.3)
=9.07-7+0.3
=2.07+0.3
=2.37
5+7×(8+12)÷(4-2)
=5+7×20÷2
=5+70
=75
16x4+16x6x16
=16x4+96x16
=16x(4+96)
=16x100
=1600
7/25×4/9+7/25×5/9
=7/25×(4/9+5/9)
=7/25×1
=7/25
60×(1/12+1/15+1/4)
=60×1/12+60×1/15+60×1/4
=5+4+15
=24
(5/12-3/8)×72
=5/12×72-3/8×72
=30-27
=3
6/7-5/24÷7/12
=6/7-5/24×12/7
=12/14-5/14
=7/14
=1/2
[3/4×(7/16-1/4)]÷9/13
=3/4×(7/16-4/16)×13/9
=1/4×3/16×13/3
=13/64
2/3-7/8+1/3
=(2/3+1/3)-7/8
=1-7/8
=1/8
5/6-(3/7-1/6)
=(5/6+1/6)-3/7
=1-3/7
=4/7
1-1/3-2/3
=1-(1/3+2/3)
=1-1
=0
1+3/5-1/10
=1+6/10-1/10
=1+1/2
=1又1/2
3/8-12/13+5/8
=3/8+5/8-12/13
=1-12/13
=1/13
1-(1/2-3/4)
=1+3/4-2/4
=1+1/4
=5/4
1-1/2-1/4
=1/2-1/4
=2/4-1/4
=1/4
2/7-8/9+5/7
=(2/7+5/7)-8/搏桐9
=1-8/9
=1/9
2-1/4-3/4
=2-(1/基茄4+3/4)
=2-1
=1
1/2-(3/8-1/2)
=1/2+1/2-3/4
=1-3/8
=5/8
2.64×1.7-2.64×0.7
=2.64×(1.7-0.7)
=2.64×1
=2.64
31.5×1.07-3.15×0.7
=3.15×10.7-3.15×0.7
=3.15×(10.7-0.7)
=3.15×10
=31.5
2.7×5.7-2.7+5.3×2.7
=2.7×(5.7-1+5.3)
=2.7×10
=27
0.625÷0.125×0.8
=(0.625×0.8)×8÷(0.125×8)
=0.5×8÷1
=4
18.6×6.1+3.9×18.6
=18.6×(6.1+3.9)
=18.6×10
=186
52.5x2.9+5.45
=5.25x29+5.25+0.2
=5.25×(29+1)+0.2
=5.25×30+0.2
=157.5+0.3
=157.7
0.92x15+0.08x15
=(0.92+0.08)×15
=1×15
=15
0.72×1.25×2.5
=0.9×(0.8×1.25)×2.5
=0.9×1×2.5
=2.25
400.6x7-2003x0.4
=200.3x14-200.3x4
=200.3×(14-4)
=200.3×10
=2003
300÷125÷8
=300÷(125×8)
=300÷1000
=0.3
396-96-172-28
=(396-96)-(172+28)
=300-200
=100
125x24
=125x8x3
=1000x3
=3000
26x15
=(20+6)x15
=20x15+6x15
=300+90
=390
25x99x4
=25x4x99
=100x99
=9900
250x32
=250x4x8
=1000x8
=8000
(98+98+98+98)x25
=4x98x25
=4x25x98
=100x98
=9800
3/基锋坦4÷5/8×3/10
=3/4×8/5×3/10
=9/5×1/5
=9/25
1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5
4800÷25÷4
=4800÷(25x4)
=4800÷100
=4800÷100
=48
2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8
3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7
3.2x0.125x2.5
=0.125x8x(0.4x2.5)
=1x1
=1
0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100
=1000
1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3
=24.9
9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999
14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
=8.3×(6.3+3.7)
=8.3×10
=83
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
=933-(157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000
1.8+18÷1.5-0.5×0.3
=1.8+12-0.15
=13.8-0.15
=13.65
6.5×8+3.5×8-47
=52+28-47
=80-47
3.7x2.56-2.3
=9.472-2.3
=7.172
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5
4800÷25÷4
=4800÷(25x4)
=4800÷100
=4800÷100
=48
2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8
3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7
3.2x0.125x2.5
=0.125x8x(0.4x2.5)
=1x1
=1
0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100
=1000
1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3
=24.9
9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999
14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
=8.3×(6.3+3.7)
=8.3×10
=83
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
=933-(157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000
9/17x8/13-13/17/8
=9/17x8/13-13/17x1/8
=72/221-13/136
=576/1768-169/1768
=407/1768
9/17x8/13+8/13/(17/8)
=9/17x8/13+8/13x8/17
=8/13x(9/17+8/17)
=8/13x1
=8/13
10.1×89-8.9
=10.1x89-89x0.1
=89x(10.1-0.1)
=89x10
=890
4x+8=4
解:4x=4-8
4x=-4
x=-4÷4
x=-1
12x+8x-12=28
解:20x=28+12
20x=40
x=40÷20
x=2
4x+2.1=8.5
解:4x=8.5-2.1
4x=6.4
x=6.4÷4
x=1.6
65y-30=100
解:65y=100+30
65y=130
y=130÷65
y=2
15x-7.5x=15
解:7.5x=15
x=15÷7.5
x=2
25%x=5
解:1/4x=5
x=5*4
x=20
20-15%x=17
解:0.15x=20-17
0.15x=3
x=3÷0.15
x=20
25%x=5
解:0.25x=5
x=5÷0.25
x=20
80%X=6/15X+96
解:4/5X=2/5X+96
4/5X-2/5X=96
2/5X=96
X=96*5/2
X=48*5
X=240
15%X+10-X=10*32%
解:0.15X-X=3.2-10
-0.85X=-6.8
X=-6.8÷(-0.85)
X=8
15%X+10-X=10*32%
解:0.15X+10-X=3.2
X-0.15X=10-3.2
0.85X=6.8
X=6.8÷0.85
X=8
8÷x=0.4
解:8÷x*x=0.4*x
0.4x=8
0.4x÷0.4=8÷0.4
x=20
5x+8x=4.7
解:13x=4.7
x=4.7/13
x=47/130
2*20x=10(60-x)
解:40x=600-10x
40x+10x=600
50x=600
x=600÷50
x=12
x÷75+x÷60=36
解:1/75x+1/60x=36
4/300x+5/300x=36
9/300x=36
x=36*300/9
x=12*100
x=1200
x-0.7x=16
解:(1-0.7)x=16
0.3x=16
x=16÷0.3
x=16/0.3
x=160/3
8(x-4)+5=45
解:8(x-4)=45-5
8(x-4)=40
x-4=40÷8
x-4=5
x=5+4
x=9
(x+10)*2.4+4=x+25+10
解:2.4x+24+4=x+35
2.4x+28=x+35
2.4x-x=35-28
1.4x=7
x=7÷1.4
x=5
4x+8=4
解:4x+8-8=4-8——等式性质
4x=-4
4x÷4=-4÷4
x=-1
7.8x-14=40
解:7.8x=40+14
7.8x=54
x=54/7.8
x=540/78
x=90/13
5x+30=6x-10
解:6x-5x=30+10
x=40
4x+8=4——方程两边除以4
解:x+2=1
x=1-2
x=-1
x:6.5=6:4
解:4x=6.5*6
4x=39
x=39/4
x=9.75
8.6x+3*6=52.4
解:8.6x+18=52.4
8.6x=52.4-18
8.6x=34.4
x=34.4÷8.6
x=4
x/5.2-1.6=1.8
解:x/5.2=1.8+1.6
x/5.2=3.4
x=3.4*5.2
x=17.68
225x=239.2x
解:239.2x-225x=0
14.2x=0
x=0÷14.2
x=0
80x+(80-20)(x+10)=4800
解:80x+60(x+10)=4800
80x+60x+600=4800
140x=4800-600
140x=4200
x=4200÷140
x=30
1.5x-0.6*15=18
解:1.5x-9=18
1.5x=18+9
1.5x=27
x=27÷1.5
x=18
6x+4(2x-1)+3(45-3x)=171
解:6x+8x-4+135-9x=171
6x+8x-9x+131=171
5x=171-131
5x=40
x=40÷5
x=8
9x*2+18*6x+17*2x=12.8
解:(18+108+34)x=12.8
160x=12.8
x=12.8÷160
x=0.08
1-4*[1/x+1/(x+5)]=(x-4)*[1/(x+5)]
解:x(x+5)-[4(x+5)+4x]=x(x-4)
x²+5x-(4x+20+4x)=x²-4x
x²+5x-8x-20=x²-4x
x²-x²-3x+4x-20=0
4x-3x=20
x=20
2x*(x-1)-x*(2x+3)=15
解:2x²-2x-2x²-3x=15
-5x=15
x=15÷(-5)
x=-3
2分之x+5分之1=3分之1x
解:2分之1x-3分之1x=-5分之1
6分之3x-6分之2x=-5分之1
6分之1x=-5分之1
x=-5分之1*6
x=-5分之6
x=-1又5分之1
8(3x+3)=72
解:3x+3=72÷8
3x+3=9
3x=9-3
3x=6
x=6÷3
x=2
8(3x+3)=72
解:24*(x+1)=72
x+1=72÷24
x+1=3
x=3-1
x=2
8(3x+3)=72
解:24x+24=72
24x=72-24
24x=48
x=48÷24
x=2
4(y+2)=24
解:y+2=24÷4
y+2=6
y=6-2
y=4
4(y+2)=24
解:4y+8=24
4y=24-8
4y=16
y=16÷4
y=4
3x+12.4=5x-3.6
解:5x-3x=12.4+3.6
2x=16
x=16÷2
x=8
x-80%x-6=16
解:x-0.8x=16+6
0.2x=22
x=22÷0.2
x=110
x-0.1x=55.404
解:(1-0.1)x=55.404
0.9x=55.404
x=55.404÷0.9
x=61.56
x+12−1/4x=1
解:x-1/4x=1-12
3/4x=-11
x=-11*4/3
x=-44/3
9分之8÷(2x)=8分之5
解:8分之5*2x=9分之8
4分之5x=9分之8
x=9分之8*5分之4
x=45分之32
5x+30=6x-10
解:6x-5x=30+10
x=40
22%x=34
解:11/50x=34
x=34*50/11
x=1700/11
7分之2x:3分之2=6
解:7分之2x=6*3分之2
7分之2x=4
x=4*2分之7
x=14
0.5x+3分之1x=9分之5
解:2分之1x+3分之1x=9分之5
6分之3x+6分之2x=9分之5
6分之5x=9分之5
x=9分之5*5分之6
x=3分之2
2x-20%×10=4.22
解:2x-2=4.22
2x=4.22+2
2x=6.22
x=6.22÷2
x=3.11
(1-65%)*X=8
解:(1-0.65)X=8
0.35X=8
X=8÷0.35
X=800/35
X=160/7
3分之2X=9分之4
解:X=9分之4*2分之3
X=3分之2
3分之2X+4分之1=12
解:3分之2X=4分之48-4分之1
3分之2X=4分之47
X=4分之47*2分之3
X=8分之141
3X-7分之5X=7分之2
解:7分之21X-7分之5X=7分之2
7分之16X=7分之2
X=7分之2*16分之7
X=8分之1
3X+5=5X-1
解:5X-3X=5+1
2X=6
X=6÷2
X=3
4x-1.5x=5
解:2.5x=5
x=5÷2.5
x=2
X+3.6=2.5X-3.6
解:2.5X-X=3.6+3.6
1.5X=7.2
X=7.2÷1.5
X=4.8
x+3.6=2.5x-3.6
解:2.5x-x=3.6+3.6
1.5x=7.2
x=7.2÷1.5
x=4.8
x-470.25=182
解:x=182+470.25
x=652.25
x÷4=6.34
解:x=6.34*4
x=25.36
8(x+2.4)=83.2
解:x+2.4=83.2÷8
x+2.4=10.4
x=10.4-2.4
x=8
7分之2x=21分之8
解:x=21分之8*2分之7
x=3分之4
x=1又3分之1
9分之8÷2x=8分之5
解:9分之8*2分之1x=8分之5
9分之4x=8分之5
x=8分之5*4分之9
x=32分之45
3.2+2x=9.8
解:1.6+x=4.9
x=4.9-1.6
x=3.3
1/3x-1/4x=12
解:4/12x-3/12x=12
1/12x=12
x=12*12
x=144
1/6x+2/3x=20
解:1/6x4/6x=20
5/6x=20
x=20*6/5
x=4*6
x=24
1/2x+1/3x=5/6
解:(1/2x+1/3x)×6=5/6×6
3x+2x=5
5x=5
x=5÷5
x=1
2x/3+5x/7=23/42
解:(2x/3+5x/7)×42=23/42×42
28x+30x=23
58x=23
x=23/58
5/6-x=1/4
解:x=5/6-1/4
x=10/12-3/12
x=7/12
x÷4/5=2/7
解:x=2/7×4/5
x=8/35
19/8-1/7x=1/8
解:1/7x=9/4
x=63/4
x=15又3/4
14+5x=42
解:5x=42-14
5x=28
x=28/5
x=5.6
7×5+65x=100
解:35+65x=100
65x=100-35
x=65/65
x=1
4x-8*7=28
解:4x=28+56
x=84/4
x=21
8x-x+18=67
解:7x+18=67
7x=67-18
7x=49
x=49÷7
x=7
x+15=200
解:x=200-15
x=185
x/2+x/3=5/6
解:(x/2+x/3)×6=5/6×6
3x+2x=5
5x=5
x=5÷5
x=1
2x/3+5x/7=23/42
解:(2x/3+5x/7)×42=23/42×42
28x+30x=23
58x=23
x=23/58
5*8+2X=60
解:40+2X=60
2X=60-40
X=20÷2
X=10
5(8+2X)=60
解:8+2X=60÷5
8+2X=12
2X=12-8
X=4÷2
X=2
5(8+2X)=60
解:8+2X=60÷5
8/2+2X/2=12/2
4+X=6
X=6-4
X=2
X-5%X=12.6
解:0.95X=12.6
X=12.6/0.95
X=1260/95
X=252/19
5分之3÷5分之6-3X=5分之1
解:3X=5分之3*6分之5-5分之1
3X=2分之1-5分之1
3X=10分之5-10分之2
3X=10分之3
X=10分之3*3分之1
X=10分之1
(X+5分之3)*50%=4
解:X+5分之3=4÷0.5
X=8-5分之3
X=7又5分之2
5分之4X-4=60
解:5分之4X=60+4
X=64*4分之5
X=16*5
X=80
1÷(X-3分之2X)=5分之4
解:5分之4*3分之1X=1
15分之4X=1
X=1*4分之15
X=4分之15
3.2+2x=9.8
解:2x=9.8-3.2
2x=6.6
x=6.6÷2
x=3.3
(8+x)*3=60
解:8+x=60÷3
8+x=20
x=20-8
x=12
(8+x)*3=60
解:24+3x=60
3x=60-24
3x=36
x=36÷3
x=12
1) x+y=4①
x-y=2
①+②:2x=6
x=3
x=3代入①:3+y=4
y=1
(2) x+2y=32 ①
x-y=8②
由①得,x=32-2y ③
把③代入② 32-2y-y=8
32-3y=8
3y=24
y=8
y=8代入③ :x=32-2×8=16
(3)2x+2y=1①
6x-6y=1②
②可简化为:2x-2y=1/3③
①+③ :4x=4/3,
x=1/3
将x=1/3,代入③中,y=1/6
(4)x+2y=5①
3x+y=10②
由①: x=5-2y代入②:3(5-2y)+y=10
15-6y+y=10
y=1
y=1代入①:x=5-2y=3
(5)租谈5x-y=2①
4x-y=7②
②-①:-x=5
x=-5
x=-5代入①:5×(-5)-y=2
y=-27
(6)2x-y=3 ①
3x+2y=8 ②
①×2+②:7x=14
x=2
x=2 代入①:y=2×2-3
y=1
(7) 2x-y=5 ①
3x+4y=2 ②
①×4+②:11x=22
x=2
x=2 代入①:2×2-y=5
y=-1
(8)2x-3y=7 ①
x-3y=7 ②
①-②:x=0
x=0 代入②-3y=7
y=-3/指型纯7
(9)2x+y=5 ①
x-3y=6 ②
①-②×2:7y=-7
y=-1
y=-1 代入②:x-3×(-1)=6
x=3
(10) x+3y=7 ①
y-x=1 ②
①+②:唯咐4y=8
y=2
y=2 代入②:2-x=1
x=1
(1) x+y=4①
x-y=2
①+②:2x=6
x=3
x=3代入①:3+y=4
y=1
(2) x+2y=32 ①
x-y=8②
由①得,x=32-2y ③
把③代入②差李 32-2y-y=8
32-3y=8
3y=24
y=8
y=8代入③ :x=32-2×8=16
(3)2x+2y=1①
6x-6y=1②
②可简化为:2x-2y=1/3③
①+③ :4x=4/3,
x=1/3
将x=1/3,代入③中,y=1/6
(4)x+2y=5①
3x+y=10②
由团庆盯①: x=5-2y代入②:3(5-2y)+y=10
15-6y+y=10
y=1
y=1代入①:x=5-2y=3
(5)5x-y=2①
4x-y=7②
②-①:-x=5
x=-5
x=-5代入①:5×(-5)-y=2
y=-27
(6)2x-y=3 ①
3x+2y=8 ②
①×2+②:7x=14
x=2
x=2 代入①:y=2×2-3
y=1
(7) 2x-y=5 ①
3x+4y=2 ②
①×4+②:塌和11x=22
x=2
x=2 代入①:2×2-y=5
y=-1
(8)2x-3y=7 ①
x-3y=7 ②
①-②:x=0
x=0 代入②-3y=7
y=-3/7
(9)2x+y=5 ①
x-3y=6 ②
①-②×2:7y=-7
y=-1
y=-1 代入②:x-3×(-1)=6
x=3
(10) x+3y=7 ①
y-x=1 ②
①+②:4y=8
y=2
y=2 代入②:2-x=1
x=1
我只能提供这么多,应为我也在找不等式
不等式..不定式30道哪去给你找~
某某家承包了一个果园,去年果园收支相抵后,结余12000元兄凯.今滚尘余天水果丰收,估计收人可比去年增加20%:并且今天因为改进了种植技术,支出比去年减少10%,这样今年结余预计比去年多11400元.请计算大滚某某家今年种植水果的收入和支出情况.
先扔给你一道吧~二元一次方程应用
以上就是数学题初一下册的全部内容,8.在代数式 中, 的同类项是 ,6的同类项是 。 求初一上学期100道数学题(计算、方程共45道,化简求值20道,应用题20道,几何体15道 好的再追加分! 1、。