作业帮①x/(x2-1) ·(x2+x)/x2其中x=2 ②(x2-1)/(x2+4x+4)÷(x+1).(x+2﹚/﹙1-x﹚其中x=-3
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①x/(x2-1) ·(x2+x)/x2其中x=2 ②(x2-1)/(x2+4x+4)÷(x+1).(x+2﹚/﹙1-x﹚其中x=-3
①x/(x2-1) ·(x2+x)/x2其中x=2 ②(x2-1)/(x2+4x+4)÷(x+1).(x+2﹚/﹙1-x﹚其中x=-3
①x/(x2-1) ·(x2+x)/x2其中x=2 ②(x2-1)/(x2+4x+4)÷(x+1).(x+2﹚/﹙1-x﹚其中x=-3
①x/(x^2-1) ·(x^2+x)/x^2
=x^2(x+1)/[(x+1)(x-1)x^2]
=1/(x-1)
=1
②(x^2-1)/(x^2+4x+4)÷(x+1).(x+2﹚/﹙1-x﹚
=-(x-1)(x+1)(x-1)/[(x+2)^2(x+1).(x+2﹚]
=-(x-1)²/(x+2)³
=-16/(-1)
=16
第三方斯蒂芬的
①
x/(x²-1)×(x²+x)/x²
=x²(x+1)/x²(x+1)(x-1)
=1/(x-1)
=1/(2-1)
=1
②
(x²-1)/(x²+4x+4)÷(x+1)(x+2)/(1-x)
=(x+1)(x-1)(1-x)/(x+2)²(x+1)
=-(x-1)²/(x+2)²
=-[(x-1)/(x+2)]²
=-[(-3-1)/(-3+2)]²
=-4²
=16
x2-3x-1=0,求①x2 1/x2;②x2-1/x2
7/x2+x+1/x2-x=6/x2-1
x2-x
lim(根号X2+X-根号X2+1)
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6x2-[-3x2-(x-1)] 化简
x2-1/x2-5x+6
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(1-x2)(x2-4x+5)
不等式（x2-4x-5)(x2+1)
x2-3x+1=0 x2/(x4-x2+1)
x2-5x+1=0则x2+x2/1
①x/(x2-1) ·(x2+x)/x2其中x=2 ②(x2-1)/(x2+4x+4)÷(x+1).(x+2﹚/﹙1-x﹚其中x=-3
y=x+√(1-x2) y2=x2+(1-x2)+2x√(1-x2)
解方程：X2--1/8(X2+2X)+X2+2X/3(X2--1)=11
解方程 2/(x2-x)+6/(1-x2)=7/(x2+x)x2为的平方
(x2+4x)/(x-1)