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数学
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已知x+y=4,xy=1,求出x²-y²+8y的值
人气:288 ℃ 时间:2019-10-11 19:45:28
解答
你好
x+y=4
y-4=x
x²-y²+8y
=x²-(y²-8y+16)+16
=x²-(y-4)²+16
=x²-x²+16
=16
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