360*72+36*280怎么简便

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360*72+36*280怎么简便

360*72+36*280怎么简便
360*72+36*280怎么简便

360*72+36*280怎么简便
=360×72+360×28
=360×(72+28)
=360×100
=36000

360*72+36*280
=36*720+36*280
=36*(720+280)
=36*1000
=36000

原试=36*720+36*280
=36*(720+280)
=36*1000=36000

原式=36×10×72+36×280
=36×(10×72)+36×280
=36×720+36×280
=36×(720+280)
=360000