若y+x=6 yx=3 那y²+x²=?
若y+x=6 yx=3 那y²+x²=?
數(shù)學人氣:681 ℃時間:2020-09-15 08:11:51
優(yōu)質(zhì)解答
x^2+y^2=(x+y)^2-2xy=36-6=30
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