29×2928

问题描述:

29×
29
28
1个回答 分类:数学 2014-10-18

问题解答:

我来补答
29×
29
28+27×
27
28,
=(28+1)×
29
28+(28-1)×
27
28,
=28×
29
28+1×
29
28+28×
27
28-1×
27
28,
=29+
29
28+27-
27
28,
=(29+27)+(
29
28-
27
28),
=56+
1
14,
=56
1
14.
 
 
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