x+2/1+x05÷(x+2/5-2x+x-2)计算
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解决时间 2021-01-27 11:32
- 提问者网友:且恨且铭记
- 2021-01-26 19:58
x+2/1+x05÷(x+2/5-2x+x-2)计算
最佳答案
- 五星知识达人网友:duile
- 2021-01-26 20:31
先化简,再求值:(1)(x+1/x²-x-x/x²-2x+1)÷1/x,x=根号2+1 急!
=((x+1)/x(x-1)-x/(x-1)²)×x
=(x+1)/(x-1)-x²/(x-1)²
=(x²-1-x²)/(x-1)²
=-1/(√2+1-1)²
=-1/2;
=((x+1)/x(x-1)-x/(x-1)²)×x
=(x+1)/(x-1)-x²/(x-1)²
=(x²-1-x²)/(x-1)²
=-1/(√2+1-1)²
=-1/2;
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