Find the minimum value of A=x^2 + y^2 if x + y =10
人气：284 ℃ 时间：2020-05-22 17:14:19
解答
A=x^2 + y^2
= x^2+(10-x)^2
=2x^2-20x+100
when x=5 A is minimun,that is 50
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