已知2x+y=4,求代数式[(x+y)
2-(x-y)
2-2y(x-
y)]÷4y的值.
人气:279 ℃ 时间:2019-08-26 07:23:49
解答
原式=[x
2+y
2+2xy-x
2-y
2+2xy-2xy+y
2]÷4y
=(2xy+y
2)÷4y
=
(2x+y)
=
×4
=1.
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