先化简再求值,(x+y)^2+2(x^2-y^2)+(x-y)^2,其中x=3,y=1/3
人气:200 ℃ 时间:2020-09-22 00:38:14
解答
(x+y)^2+2(x^2-y^2)+(x-y)^2
=(x+y)^2+2(x-y)(x+y)+(x-y)^2
=(x+y+x-y)^2
=4x^2
=4×3^2
=36
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