72×56+72×45-72怎么简便运算?

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72×56+72×45-72怎么简便运算?72×56+72×45-72怎么简便运算?72×56+72×45-72怎么简便运算?原题=72*(56+45-1)=72*100=720072×56+72×4

72×56+72×45-72怎么简便运算?
72×56+72×45-72怎么简便运算?

72×56+72×45-72怎么简便运算?
原题=72*(56+45-1)
=72*100
=7200

72×56+72×45-72
=72×56+72×45-72×1
=72×(56+45-1)
=72×(55+45)
=72×100
=7200.