18/[9/(x+1)+9/(x-0.5)]=x不要copy的.

题目详情

18/[9/(x+1)+9/(x-0.5)]=x 不要copy的.

▼优质解答

答案和解析

18/[9/(x+1)+9/(x-0.5)]=2/[1/(x+1)+1/(x-0.5)]=2(x+1)(x-0.5)/(2x+0.5)=x
2x^2+x-1=2x^2+0.5x
0.5x=1
x=2

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