在横线里填上合适的质数.12=______+______=______+______+______20=______+______=______+______30=______×______×____

题目简介

在横线里填上合适的质数.12=______+______=______+______+______20=______+______=______+______30=______×______×____

题目详情

在横线里填上合适的质数.
12=______+______=______+______+______
20=______+______=______+______
30=______×______×______
39=______+______=______-______.
题型:解答题难度:中档来源:不详

答案

12=5+7=2+3+7,
20=3+17=7+13,
30=2×3×5,
39=2+37=41-2.
故答案为:5,7,2,3,7;3,17,7,13;2,3,5;2,37,41,2.

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