Question

大哥大姐帮忙做一下解方程吧！！！！！

45x=38(x+1)
x/36-x/45=4
80x+300=(80*1.25)x
(68-2x)/(16-2x)=5
5x+110=1300+x

要有过程啊

Answer 1

45x=38(x+1)
45x=38x+38
45x-38x=38
7x=38
x=38/7

x/36-x/45=4
5x-4x=4*180
x=720

80x+300=(80*1.25)x
80x+300=100x
100x-80x=300
20x=300
x=15

(68-2x)/(16-2x)=5
68-2x=5×（16-2x）
68-2x=80-10x
10x-2x=80-68
8x=12
x=1.5

5x+110=1300+x
5x-x=1300-110
4x=1190
x=297.5

5x+1100=1300+x
5x-x=1300-1100
4x=200
x=50

追问

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Answer 2

45x-38x=7x=38 x=38/7
x/36-x/45=5x/180-4x/180=x/180=4 x=720
80x+300=(80*1.25)x=100x 300=(100-80)x 300=20x x=15
68-2x=5*(16-2x)=80-10x 10x-2x=80-68 8x=12 x=1.5
5x-x=1300-110 4x=1190 x=297.5

Answer 3

1. 45x-38x=38 7x=38 x=38/7
2. 45x-36x=6480 x=720
3. 80x-10x=-300 x=-300/70=-30/7
4.
5. 4x=1190 x=297.5

Answer 4

1
45x=38x+38
7x=38
x=38/7
2
5x/180-4x/180=4
x/180=4
x=720
3
80x+300=100x
300=20x
x=15
4
68-2x=5*(16-2x)
68-2x=80-10x
8x=12
x=1.5
5
4x=1190
x=297.5