问题标题:
按要求从1,3,5,7,9中选出几个数字分别填进括号里,写成乘法算式.(1)要使积最大,应该怎样填?()()()X()()()()X()()(2)要使积最小,应该()()()X()()()()X()()
问题描述:

按要求从1,3,5,7,9中选出几个数字分别填进括号里,写成乘法算式.

(1)要使积最大,应该怎样填?

()()()X()()()()X()()

(2)要使积最小,应该

()()()X()()()()X()()

黄晓回答:
  (1)要使积最大,应该怎样填?   (7)(5)(3)X(9)(5)(3)(1)X(9)(7)   (2)要使积最小,应该   (3)(5)(7)X(1)(5)(7)(9)X(1)(3)
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