列 :8x-4=9x+7解:8x-9x=7+4 -x=11 x=-11

问题描述:

列 :8x-4=9x+7解:8x-9x=7+4 -x=11 x=-11
题:1 .5x-(3x-7)=2+(3-2x)
2 .6x+2=4x-5
3 .3x+18 =5x-4(3-2x)
正确率要保证哦~

1 .5x-(3x-7)=2+(3-2x)
5x-3x+7=2+3-2x
2x+2x=5-7
4x=-2
x=-0.5
2 .6x+2=4x-5
6x-4x=-5-2
2x=-7
x=-7/2
x=-3.5
3 .3x+18 =5x-4(3-2x)
3x-5x=-12+8x-18
-2x-8x=-30
-10x=-30
x=3