(1)5x+3=-7x+9(2)5(x-1)-2(3x-1)=4x-1

日期:2016-08-11 23:19:23 人气:1

(1)5x+3=-7x+9(2)5(x-1)-2(3x-1)=4x-1

(1)移项得:5x+7x=9-3,合并得:12x=6,系数化为1得:x=12.(2)去括号得:5x-5-6x+2=4x-1,移项得:5x-6x-4x=-1+5-2合并得:-5x=2,系数化为1得:x=-25.
    A+
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