先化简分式:2/x+2- x²+2x+1/x+2÷ x²-1/x-1,然后
在-2,-1,0,1中选一个你认为合适的x值,带入求值 我把题目打的清楚点 x/x+2- ²+2x-1/x+2÷ x²-1/x-1
人气:458 ℃ 时间:2019-10-23 11:45:58
解答
=2/(x+2) -(x+1)²/(x+2)×(x-1)/(x+1)(x-1)
=2/(x+2)-(x+1)/(x+2)
=(2-x-1)/(x+2)
=(1-x)/(x+2)
当x=0时
原式=(1-0)/(0+2)=1/2
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