把83看成80与三的和,或者是把74看成70与四的和,然后再利用乘法分配律进行计算,83Ⅹ74
=(80十3)Ⅹ74
=80Ⅹ74十3Ⅹ74
=5920+222
=6142
=
83×74如何巧算
83×74
=(80+3)×(70+4)
=80×70+80×4+3×70+3×4
=5600+320+210+12
=6142
把83看成80与三的和,或者是把74看成70与四的和,然后再利用乘法分配律进行计算,83Ⅹ74
=(80十3)Ⅹ74
=80Ⅹ74十3Ⅹ74
=5920+222
=6142
=
83×74如何巧算
83×74
=(80+3)×(70+4)
=80×70+80×4+3×70+3×4
=5600+320+210+12
=6142