已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,注意是4x2-4y2,
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已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,注意是4x2-4y2,已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,注意是4x2-4y2,
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
注意是4x2-4y2,
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,注意是4x2-4y2,
[(x^2+y^2)-(x-y)^2+2y(x-y)]÷4y=1
(x^2+y^2-x^2+2xy-y^2+2xy-2y^2)÷4y=1
(4xy-2y^2)4y=1
2x-y=2
4x/(4x^2-y^2)-1/(2x+y)=4x/(2x+y)(2x-y)-1/(2x+y)
=(4x-2x+y)/(2x+y)(2x-y)
=(2x+y)/(2x+y)(2x-y)
=1/(2x-y)
=1/2
你要注意的4x2-4y2是什么意思 在做了