已知(x+y)²=5,(x-y)²=3,求x³y³的值
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已知(x+y)²=5,(x-y)²=3,求x³y³的值
已知(x+y)²=5,(x-y)²=3,求x³y³的值
已知(x+y)²=5,(x-y)²=3,求x³y³的值
X^2+2XY+Y^2=5
X^2-2XY+Y^2=3
两式子相减 4XY=2
XY=1/2
(XY)^3=1/8
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