arckham
幼苗
共回答了10个问题采纳率:100% 举报
1)15-(7-5x)=2x+(5-3x)
15-7+5x=2x+5-3x
5x+3x-2x=5+7-15
6x=-3
x=-1/2;
2)x-(x-1)/2=(2x-1)/3-1
6x-3(x-1)=2(2x-1)-6
6x-3x+3=4x-2-6
-x=-8-3
x=11
3)(4x+3)/5-(x-4)/3=1
3(4x+3)-5(x-4)=15
12x+9-5x+20=15
7x+29=15
7x=-14
x=-2.
1年前
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