求21题答案。
3个回答
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原式
=[(x²+x-x)/(x+1)(x-1)] •[(x-1)²/x(x-1)]
=x/(x+1)
=√2/(√2+1)
=√2(√2-1)/(√2+1)(√2-1)
=2-√2
=[(x²+x-x)/(x+1)(x-1)] •[(x-1)²/x(x-1)]
=x/(x+1)
=√2/(√2+1)
=√2(√2-1)/(√2+1)(√2-1)
=2-√2
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