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计算（1）3x/8y×16y²/27x² （2）（2xy-x²）÷x-2y/xy 2x-6/x²-4x+4×2x-4/x-3
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计算（1）3x/8y×16y²/27x² （2）（2xy-x²）÷x-2y/xy 2x-6/x²-4x+4×2x-4/x-3
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答案和解析
（1）3x/8y×16y²/27x²
=(3/8×16/27)×(y/x)
=2y/9x
（2）（2xy-x²）÷x-2y/xy
=x(2y-x)×[xy/(x-2y)]
=-x²y
(3) 2x-6/x²-4x+4×2x-4/x-3
=2(x-3)/(x-2)²×2(x-2)/(x-3)
=4/(x-2)
=(3/8×16/27)×(y/x)
=2y/9x
（2）（2xy-x²）÷x-2y/xy
=x(2y-x)×[xy/(x-2y)]
=-x²y
(3) 2x-6/x²-4x+4×2x-4/x-3
=2(x-3)/(x-2)²×2(x-2)/(x-3)
=4/(x-2)
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