解方程(1)x-7=10-4(x+0.5) (2)(x-3)/5-(x-4)/3=1

问题描述:

解方程(1)x-7=10-4(x+0.5) (2)(x-3)/5-(x-4)/3=1

(1)x=3
(2)X=7

1.X-7=10-4X+2;5X-2.5X=7+10;2.5X=17;X=17/2.5;
2.两边都乘以15;3(x-3)-5(x-4)=15;3x-9-5x+20=15;-2x=4;x=-2

(1)x-7=10-4(x+0.5)
x-7=10-4x-2
x+4x=8+7
5x=15
x=3
(2) (x-3)/5-(x-4)/3=1
3(x-3)-5(x-4)=15
3x-9-5x+20=15
-2x=15+9-20
-2x=4
x=-2

(1)x=3(2)x=-2