有1,2,3,4,5,7,8,9,10,30,40,50,60,70,80,90共16张卡片,积720是由那两张卡片组成?想一想,找一找,填一填(每张卡片只用一次)卡片分别写:1,2,3,4,5,7,8,9,10,30,40,50,60,70,80,90积720是由那两张卡片组成?积160是
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