1樓:匿名使用者
(1÷x+1 + x²-2x+1÷ x²-1)÷ x-1÷x+1=(1/(x+1)+(x-1)²/(x-1)(x+1))×(x+1)/(x-1)
=(1/(x+1)+(x-1)/(x+1))×(x+1)/(x-1)=(x/(x+1))×(x+1)/(x-1)=x/(x-1)
=2÷(2-1)=2
2樓:匿名使用者
先化簡,在求值:(1/x+x²-2x+1/x²-1)÷x-1/x+1,其中x=2.請大家詳細化簡
解,得:
==(1/x+x²-2x+1/x²-1)*(x+1)/(x-1)==[1/x(1+x)]*[(x+1)/(x-1)]-[(2x+1)/(x-1)(x+1)]*[(x+1)/(x-1)]
==1/x(x-1)-(2x+1)/(x-1)^2把x帶入1/x(x-1)-(2x+1)/(x-1)^2得1/2-5
==-4又1/2
先化簡,再求值(x+1/x^2-1+x/x-1)÷x+1/x^2-2x+1,其中x=2.(求過程)
先化簡再求值:1/(x+2)-(x^2+2x+1)/(x-2)÷(x^2-1)/(x-1),其中x=(根號2)-2 5
3樓:匿名使用者
1/(baix+2)du-(x^2+2x+1)/(zhix-2)÷(daox^2-1)/(x-1),其中x=(根號
回2)-2
=1/(x+2)-(x+1)^2/(x-2) *(x-1)/(x-1)(x+1)
=1/(x+2)-(x+1)/(x-2)
=1/(x+2)-(x+1)/(x-2)
=[(x-2-(x+2)(x+1)]/[(x+2)(答x-2)]
=(x-2-x^2-3x-2)/[(x+2)(x-2)]=-(x^2+2x+4)/[(x+2)(x-2)]=-[(√2-2)^2+2(√2-2)+4]/[((√2-2)+2)((√2-2)-2)]
=-[2-4√2+4+2√2-4+4]/[(√2)(√2-4)]=-[6-2√2]/[(√2)(√2-4)]=-[3√2-2]/[(√2-4)]
=-[(3√2-2)(√2+4)]/[(√2+4)(√2-4)]=-[(6+12√2-2√2-8)]/[(2-16)]=-[(-2+10√2)]/[(-14)]=(-1+5√2)/7
4樓:匿名使用者
(4 + 2 x + x^2)/(4 - x^2)
=(3 - sqrt[2])/(-1 + 2 sqrt[2])
5樓:匿名使用者
^解:制1/(x+2)-(x^2+2x+1)/(x-2)÷(x^2-1)/(x-1)
=1/(x+2)-(x+1)²/(x-2) *(x-1)/[(x+1)(x-1)]
=1/(x+2)-(x+1)/(x-2)
=(1-x-1)/(x-2)
=-x/(x-2)
當x=√
2-2時,
原式=-(√2-2)/(√2-2-2)
=(2-√2)(√2+4)/[(√2+4)(√2-4)]=(√2+8-2-4√2)/(2-16)
=(3√2-6)/14
先化簡,再求值:〔(x-1)/x—(x-2)/x+1 〕÷〔2x²-x/x²+2x+1〕其中x滿足x²-x-1=0
6樓:忘記虛空
^[(x-1)/x-(x-2)/(x+1)]÷(2x^2-x)/(x^2+2x+1)
=[(x-1)(x+1)/x(x+1)-x(x-2)/x(x+1)]×(x+1)^2/x(2x-1)
=(x^2-1-x^2+2x)/x(x+1)×(x+1)^2/x(2x-1)
=(2x-1)/x(x+1)×(x+1)^2/x(2x-1)=(x+1)/(x^2)
x^2-x-1=0
x^2=x+1
原式=(x+1)/(x^2)
=(x^2)/(x^2)=1
7樓:叫我水兒好了
x為正負1
因為1乘以任何數都等於它本身。
8樓:行覓蒿秋白
解:原式=[(x-1)/x-(x-2)/(x+1)]÷[(2x²-x)/(x²+2x+1)]
=÷[x(2x-1)/(x+1)²]
=×=×
=(x+1)/x²
∵x²-x-1=0
∴x²=x+1
∴原式=x²/x²=1
先化簡,再求值:(1-x/x+2)·(x2-4/x2-2x+1)÷(1/x2-1)其中x2-x=0.謝謝!
9樓:我不是他舅
原式=-(x-1)/(x+2)*(x+2)(x-2)/(x-1)²*(x²-1)
=-(x-2)/(x-1)*(x+1)(x-1)=-(x-2)(x+1)
=-(x²-x-2)
=-(0-2)=2
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