(1)x²+y²-2xy分之xy (分开的) 乘 3x²分之x-y (2)(x-y分之x
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(1)x²+y²-2xy分之xy (分开的) 乘 3x²分之x-y (2)(x-y分之x - x-y分之2y) 乘 下面还有
(1)x²+y²-2xy分之xy ( 分开的) 乘 3x²分之x-y
(2)(x-y分之x - x-y分之2y) 乘 x-2y分之xy 除以(x分之1+y分之1)
(1)x²+y²-2xy分之xy ( 分开的) 乘 3x²分之x-y
(2)(x-y分之x - x-y分之2y) 乘 x-2y分之xy 除以(x分之1+y分之1)
(1)x²+y²-2xy分之xy ( 分开的) 乘 3x²分之x-y
=xy/(x-y)²×(x-y)/3x²
=y/3x(x-y)
=y/(3x²-3xy)
(2)(x-y分之x - x-y分之2y) 乘 x-2y分之xy 除以(x分之1+y分之1)
=(x-2y)/(x-y)×xy/(x-2y)×xy/(x+y)
=x²y²/(x-y)(x+y)
=x²y²/(x²-y²)
=xy/(x-y)²×(x-y)/3x²
=y/3x(x-y)
=y/(3x²-3xy)
(2)(x-y分之x - x-y分之2y) 乘 x-2y分之xy 除以(x分之1+y分之1)
=(x-2y)/(x-y)×xy/(x-2y)×xy/(x+y)
=x²y²/(x-y)(x+y)
=x²y²/(x²-y²)
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