化简求值 x 2分之x² 2x 1÷x-1分之x²-1-x 2分之1,其中x=2

（1）原式=(x+1)(x−3)(x+1)(x−1)×x−1x−3=1，当x=2时，原式=1；（2）如右图所示，设BD=x，则CD=14-x，∵AD⊥BC，∴∠ADB=∠ADC=90°，在Rt△ABD

x1+x2=-5,x1x2=-31)|x1-x2|^2=(x1+x2)^2-4x1x2=25+12=37|x1-x2|=√372)1/x1^2+1/x2^2=(x1^2+x2^2)/(x1x2)^2=

[3x/(x-1)-x/(x+1)]÷x/(x²-1)=[3x/(x-1)-x/(x+1)]*(x²-1)/x=[3x/(x-1)]*(x²-1)/x-[x/(x+1)]

X1＋X2=-B/A=2X1*X2=C/A=1/2求得X1=1+根号2或者X1=1-根号2从而求出X2的值X1/X2+X2/X1=(X1*X1+X2*X2)/(X1X2)=6

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原式=3x2+2x2-3x+4x-5x2=x，当x=2010时，原式=2010．

原式=[3x/(x-1)-2x/(x+1)]*(x+1)(x-1)/x=3x/(x-1)*(x+1)(x-1)/x-2x/(x+1)*(x+1)(x-1)/x=3(x+1)-2(x-1)=3x+3-2

x²+2x+1=10（x+1)²=10x+1=3或x+1=-3所以x=2或x=-4【（x²+4)/x-4】÷【（x²-4)/(x²+2x)】=【（x&

原式=3x2-（7x2-2x2+6x-2x）=3x2-5x2-4x=-2x2-4x，∵|x|=2，∴x=±2，当x=2时，原式=-2×22-4×2=-16；当x=-2时，原式=-2×（-2）2-4×（

原式=(x-1)(x+1)/(x+2)*(x+2)/x-1=x+1然后代入数值即可很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按钮,

(x^2-2x+1)/(x^2-1)+1/(x+1)=(x-1)^2/(x+1)(x-1)+1/(x+1)=(x-1)/(x+1)+1/(x+1)=x/(x+1)=1-根2分之一

原式=（x-2+2x+4)/(x+2)(x-2）*x(x+2)/3x+2)=x/(x-2)当x-2+根号3时,原式=（2+根号3）/（2+根号3）-2=（2根号3+3）/3

{1-x/(x-1)}÷1/x(x-1)=(x-1-x)/(x-1)÷1/x(x-1)=-1/(x-1)÷1/x(x-1)=-x

详细而规范的解答过程看图,明白就采纳,

5x=-3yx=-3|5y直接带进去得答案,或者=2\3x-2|3x+2|x+y的和乘（x+y）除以x-y|x=2乘x\x-y=2（-3\5y）\（-3\5y-y）=3\4手机果然不行.

原式=2x²-4x²+3x-3x+7+1=-2x²+8=-2*2²+8=-8+8=0

X2/X2-1÷(1-2X/X-1-X+1)＝X^2/(x^2-1)÷[(1-2x)/(x-1)-(x-1)]=x^2/(x^2-1)÷[(1-2x-(x^2-2x+1)/(x-1)]=x^2/(x+

[（x+2)/x-(x-1)/(x-2)]÷（x-4)/x=[1+2/x-1-1/(x-2)]×x/(x-4)=(x-4)/x(x-2)×x/(x-4)=1/(x-2)=1/(3-2)=1这是我在静心

x1+x2=4x1x2=-1(x1+x2)^2/(1/x1+1/x2)=(x1+x2)^2*x1x2/(x1+x2)=x1x2*(x1+x2)=-4

原式=2x3+4x-2x2-x-3x2+2x3=4x3-5x2+3x，当x=-2时，原式=-32-20-6=-58．