
数学题 速度
计算(1)x²-4y²/x²+4x+4·x+2/3x²+6xy(2)y²-x²/5x²-4xy÷x+...
计算
(1)x²-4y²/x²+4x+4 · x+2/3x²+6xy
(2)y²-x²/5x²-4xy÷x+y/5x-4y 展开
(1)x²-4y²/x²+4x+4 · x+2/3x²+6xy
(2)y²-x²/5x²-4xy÷x+y/5x-4y 展开
1个回答
展开全部
1、(x+2y)(x-2y)/(x-2)²×(x-2)/3x(x+2y)
=(x-2y)/3x(x-2)
=(x-2y)/(3x²-6x)
2、=-(x+y)(x-y)/x(5x-4y)×(5x-4y)/(x+y)
=-(x-y)/x
=(y-x)/x
=(x-2y)/3x(x-2)
=(x-2y)/(3x²-6x)
2、=-(x+y)(x-y)/x(5x-4y)×(5x-4y)/(x+y)
=-(x-y)/x
=(y-x)/x
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