x^2-4y^2/(x^2+4xy+4y^2)-x/(x+2y),其中x=-4,y=-3

种子416讨力2022-10-04 11:39:541条回答

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风物语的小世界 共回答了13个问题 | 采纳率92.3%
原式=(x+2y)(x-2y)/(x+2y)²-x/(x+2y)
=(x-2y)/(x+2y)-x/(x+2y)
=(x-2y-x)/(x+2y)
=-2y/(x+2y)
=-2×(-3)/[-4+2×(-3)
=3/5
1年前

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=(x+4)^2+(y+3)^2=0
则x+4=0
y+3=0
(x^2-4y^2)/(x^2+4xy+4y^2)-x/(x+2y)
=[(x+2y)(x-2y)]/(x+2y)^2-x/(x+2y)
=(x-2y)/(x+2y)-x/(x+2y)
=-2y/(x+2y)
=6/-10
=-3/5