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数学
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已知x+2y=1,则2的x方+4的y方最小值?
人气:365 ℃ 时间:2019-08-20 11:06:10
解答
把4的y方写成2的2y方,然后再把2的2y方和2的x方合并,就是2的x+2y方,就等于2
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