64×42加36×12用简便方法计算

64×42加36×12用简便方法计算

第1个回答  2016-06-03
原式
=64x42+36x12
=64x(30+12)+36x12
=64x30+64x12+36x12
=1920+(64+36)x12
=1920+100x12
=1920+1200
=3120

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