如题所述
简便计算
102x99
=100x99+2x99
=9900+198
=9900+200-2
=10100-2
=10098
99x87 +99x14-99
=99x(87+14-1)
=99x100
=9900
102x99
=100x99+2x99
=9900+198
=9900+200-2
=10100-2
=10098
99x87 +99x14-99
=99x(87+14-1)
=99x100
=9900
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