1.2(x-2)-3(4x-1)=9(1-x)
2x-4-12x+3=9-9x
x=-10
2.11x+64-2x=100-9x
18x=36
x=2
3.15-(8-5x)=7x+(4-3x)
15-8+5x=7x+4-3x
x=-3
4.3(x-7)-2[9-4(2-x)]=22
3x-21-2(9-8+4x)=22
3x-21-2-8x=22
-5x=55
x=-11
5.2(x-2)+2=x+1
2x-4+2=x+1
x=3
6.30x-10(10-x)=100
30x-100+10x=100
40x=200
x=50
7.4(x+2)=5(x-2)
4x+8=5x-10
x=18
8.120-4(x+5)=28
120-4x-20=28
-4x=-72
x=18
9.15x+854-65x=54
-50x=-800
x=16
10.3(x-2)+1=x-(2x-1)
3x-6+1=x-2x+1
4x=6
x=3/2
11.11x+64-2x=100-9x
18x=36
x=2
12.14.59+x-25.31=0
x=10.72
13.(x-6)×7=2x -2
7x-42=2x-2
5x=40
x=8
14.3x+x=18
4x=18
x=9/2
15.12.5-3x=6.5
3x=6
x=2
16.1.2(x-0.6)=4.8
1.2x- 7.2=4.8
1.2x=12
x=10
17.x+12.5=3.5x
2.5x=12.5
x=5
18.8x-22.8=1.2
8x=21.6
x=2.7
19.2x=5x-3
3x=3
x=1
20.x+5=8
x=3 这是一元一次的
1) 66x+17y=3967
25x+y=1200
答案：x=48 y=47
(2) 18x+23y=2303
74x-y=1998
答案：x=27 y=79
(3) 44x+90y=7796
44x+y=3476
答案：x=79 y=48
(4) 76x-66y=4082
30x-y=2940
答案：x=98 y=51
(5) 67x+54y=8546
71x-y=5680
答案：x=80 y=59
(6) 42x-95y=-1410
21x-y=1575
答案：x=75 y=48
(7) 47x-40y=853
34x-y=2006
答案：x=59 y=48
(8) 19x-32y=-1786
75x+y=4950
答案：x=66 y=95
(9) 97x+24y=7202
58x-y=2900
答案：x=50 y=98
(10) 42x+85y=6362
63x-y=1638
答案：x=26 y=62
(11) 85x-92y=-2518
27x-y=486
答案：x=18 y=44
(12) 79x+40y=2419
56x-y=1176
答案：x=21 y=19
(13) 80x-87y=2156
22x-y=880
答案：x=40 y=12
(14) 32x+62y=5134
57x+y=2850
答案：x=50 y=57
(15) 83x-49y=82
59x+y=2183
答案：x=37 y=61
(16) 91x+70y=5845
95x-y=4275
答案：x=45 y=25
(17) 29x+44y=5281
88x-y=3608
答案：x=41 y=93
(18) 25x-95y=-4355
40x-y=2000
答案：x=50 y=59
(19) 54x+68y=3284
78x+y=1404
答案：x=18 y=34
(20) 70x+13y=3520
52x+y=2132
答案：x=41 y=50
二元一次方程组 供楼主自行选择