已(X+Y)²=7,(X-Y)²=3 求X²+Y²=?X*Y=?
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已(X+Y)²=7,(X-Y)²=3 求X²+Y²=?X*Y=?
已(X+Y)²=7,(X-Y)²=3 求X²+Y²=?X*Y=?
已(X+Y)²=7,(X-Y)²=3 求X²+Y²=?X*Y=?
写纸上拍下来给你看看吧.
(X+Y)²=7 | (1)
(X-Y)²=3 | (2)
X²+Y²=[(1)+(2)]/2=5
x*y=[(1)-(2)]/4=1