(1)x²-1/x²+4x+4÷(x+1)乘x+2/1-x
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(1)x²-1/x²+4x+4÷(x+1)乘x+2/1-x
(3)(2xy分之-mn)²÷8x²/y²乘(-2m分之y²)³ (2)(xy-x²)÷x²-2xy+y²/xy乘x-y/x²
(3)(2xy分之-mn)²÷8x²/y²乘(-2m分之y²)³ (2)(xy-x²)÷x²-2xy+y²/xy乘x-y/x²
(1)(x²-1)/(x²+4x+4)÷(x+1)*(x+2)/(1-x)
=(x+1)(x-1)/(x+2)²*1/(x+1)*(x+2)/(1-x)
=-1/(x+2)
(2)
(xy-x²)÷(x²-2xy+y²)/xy*(x-y)/x²
=-x(x-y)÷(x-y)²/xy*(x-y)/x²
=-x(x-y)*xy/(x-y)²*(x-y)/x²
=-y
(3)
原式
=(-mn/2xy)²*y²/8x²*(-y²/2m)³
=m²n²/4x²y²*y²/8x²*(-y^6/8m³)
=-m²n²/4x²y²*y²/8x²*y^6/8m³
=n²y^6/(256mx⁴)
=(x+1)(x-1)/(x+2)²*1/(x+1)*(x+2)/(1-x)
=-1/(x+2)
(2)
(xy-x²)÷(x²-2xy+y²)/xy*(x-y)/x²
=-x(x-y)÷(x-y)²/xy*(x-y)/x²
=-x(x-y)*xy/(x-y)²*(x-y)/x²
=-y
(3)
原式
=(-mn/2xy)²*y²/8x²*(-y²/2m)³
=m²n²/4x²y²*y²/8x²*(-y^6/8m³)
=-m²n²/4x²y²*y²/8x²*y^6/8m³
=n²y^6/(256mx⁴)
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