36×48-39+46×54的巧算
36×48-39+46×54的巧算
36×48-39+46×54
=46*48-46+46*54-48*10-7
=46*(48-1+54)-487
=46*100+46-487
=4646-487
=4159
36×48-39+46×54
=46*48-46+46*54-48*10-7
=46*(48-1+54)-487
=46*100+46-487
=4646-487
=4159
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