来自胡祖宝的问题
【用一根长64cm的绳子剪成两段,每段围城一个正方形,试问怎样分可以使得两个正方形面积之和最小最小值是?】
用一根长64cm的绳子剪成两段,每段围城一个正方形,试问怎样分可以使得两个正方形面积之和最小最小值是?
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2020-06-09 10:19
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李长红
设一段长xcm
正方形面积之和＝（x/4）²+[（64-x）/4]²＝（1/8）（x-32）²+128
当两段绳子长度相等时（x＝32）,正方形面积之和最小,最小值＝128（cm²）
2020-06-09 10:20:45
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