运动会上两个班同学分别排出下面两种队形,算一算两个班各有多少人。
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●● ●● ● ●● ●● ● ●● ●● ● ●● ●● ● ●● ●● ● ●● ●● ● ●● ●● ●
9×4=36(人)
5×7=35(人)
认一认
9×4=36,36是9和4的倍数,9和4是36的因数。