先化简,再求值÷x^2-2x+1分之x+2 其中x=
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化简,再求值:x^2-1分之2÷x^2+2x+1分之2x+2加x-1分之1,其中x=根号2+1
优质解答
(x^2-1)分之2÷(x^2+2x+1)分之(2x+2)加(x-1)分之1
=(x-1)(x+1)分之2÷(x+1)^2分之2(x+1)加(x-1)分之1
=(x-1)(x+1)分之2×2(x+1)分之(x+1)^2加(x-1)分之1
=1/(x-1)+1/(x-1)
=2/(x-1)
x=√2+1时
原式=2/(√2+1-1)=2/√2=√2
优质解答
(x^2-1)分之2÷(x^2+2x+1)分之(2x+2)加(x-1)分之1
=(x-1)(x+1)分之2÷(x+1)^2分之2(x+1)加(x-1)分之1
=(x-1)(x+1)分之2×2(x+1)分之(x+1)^2加(x-1)分之1
=1/(x-1)+1/(x-1)
=2/(x-1)
x=√2+1时
原式=2/(√2+1-1)=2/√2=√2
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