(1/x-y+1/x+y)÷2x/x²+2xy+y².其中x=-2.化解求值.求步骤!急!
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(1/x-y+1/x+y)÷2x/x²+2xy+y².其中x=-2.化解求值.求步骤!急!
(1/x-y+1/x+y)÷2x/x²+2xy+y².其中x=-2.化解求值.求步骤!急!
(1/x-y+1/x+y)÷2x/x²+2xy+y².其中x=-2.化解求值.求步骤!急!
您好:
(1/x-y+1/x+y)/2x/x^2+2xy+y^2
=(x+y+x-y)/(x+y)(x-y)÷2x/(x+y)²
=2x/(x+y)(x-y)÷2x/(x+y)²
=(x+y)/(x-y)
因为x=-2
所以代入得(-1+y)/(-2-y)