十八题求解答,好评给起,谢谢,要过程的
2个回答
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mx+2=2(m-x) mx+2=2m-2x mx+2x=2m-2 (m+2)x=2m-2 x=(2m-2)/(m+2)
所以|(2m-2)/(m+2)-1/2|=3/2
假设(2m-2)/(m+2)-1/2>0时,
则(2m-2)/(m+2)-1/2=3/2
(2m-2)/(m+2)=2,
2m-2=2m+4,不成立,所以(2m-2)/(m+2)-1/2<0
即(2m-2)/(m+2)-1/2=-3/2
(2m-2)/(m+2)=-1
2m-2=-m-2 m=0
所以|(2m-2)/(m+2)-1/2|=3/2
假设(2m-2)/(m+2)-1/2>0时,
则(2m-2)/(m+2)-1/2=3/2
(2m-2)/(m+2)=2,
2m-2=2m+4,不成立,所以(2m-2)/(m+2)-1/2<0
即(2m-2)/(m+2)-1/2=-3/2
(2m-2)/(m+2)=-1
2m-2=-m-2 m=0
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