已知(x y)²=25,(x-y)²=9求x² y²的值
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已知(x y)²=25,(x-y)²=9求x² y²的值
已知(x y)²=25,(x-y)²=9求x² y²的值
已知(x y)²=25,(x-y)²=9求x² y²的值
(x+ y)²=25
(x-y)²=9
(x+ y)²-(x-y)²=4x*y=16
x² y²=16