先化简,再求值
3个回答
展开全部
原式=(x-2)/(x+1)(x-1)*(x+1)²/2(x+1)+1/(x+1)
=(x-2)/(x+1)(x-1)*(x+1)/2+1/(x+1)
=(x-2)/2(x-1)+1/(x+1)
=(x²-x-2+2x-2)/2(x+1)(x-1)
=x(x+1)/2(x+1)(x-1)
=x/2(x-1)
=(√2+1)/2√2
=(2+√2)/4
=(x-2)/(x+1)(x-1)*(x+1)/2+1/(x+1)
=(x-2)/2(x-1)+1/(x+1)
=(x²-x-2+2x-2)/2(x+1)(x-1)
=x(x+1)/2(x+1)(x-1)
=x/2(x-1)
=(√2+1)/2√2
=(2+√2)/4
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展开全部
原式=(x-2)/(x+1)(x-1)×(x+1)²/2(x+1)+1/(x-1)
=(x-2)/2(x-1)+1/(x-1)
=(x-2)/2(x-1)+2/2(x-1)
=x/2(x-1)
当x=√2+1时
原式=(√2+1)/2(√2+1-1)
=(2+√2)/4
=(x-2)/2(x-1)+1/(x-1)
=(x-2)/2(x-1)+2/2(x-1)
=x/2(x-1)
当x=√2+1时
原式=(√2+1)/2(√2+1-1)
=(2+√2)/4
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评论
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