21×36+36×21=?72×26 +36×48简便方法用简便方法怎么算
1个回答
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①
21×36+36×21
=36×21+21×4+21×32
=21×（4+36）+21×32
=21×40+21×32
=21×40+21×30+21×2
=21×（40+30）+42
=21×70+42
=1470+42
=1512
②
72×26
+36×48
=2×36×26+36×48
=36×52+36×48
=36×（52+48）
=36×100
=3600
楼主,你看如何?
我qq82812785
,欢迎各位网友与我探讨!
21×36+36×21
=36×21+21×4+21×32
=21×（4+36）+21×32
=21×40+21×32
=21×40+21×30+21×2
=21×（40+30）+42
=21×70+42
=1470+42
=1512
②
72×26
+36×48
=2×36×26+36×48
=36×52+36×48
=36×（52+48）
=36×100
=3600
楼主,你看如何?
我qq82812785
,欢迎各位网友与我探讨!
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