xy=6,x-y=5,x^2y+xy^2
人气：325 ℃ 时间：2020-02-02 14:34:37
解答
(x+y)" = (x-y)"+4xy = 25 + 24 =49
x+y = ±7
x"y+xy" = xy(x+y) = ±42
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