解方程:(1)-7x=2+2x-4 (2)4-2/5x=5/2-x (3)2/5x-4=6+3/5x (4)-2x+1=4x+4
人气:165 ℃ 时间:2019-10-23 14:35:38
解答
(1)-7x=2+2x-4
-9x=-2
x=2/9
(2)4-2/5x=5/2-x
3/5x=-3/2
x=-5/2
(3)2/5x-4=6+3/5x
-1/5x=10
x=-50
(4)-2x+1=4x+4
-6x=3
x=-1/2
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