简便法128*960+8720*69

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简便法128*960+8720*69

简便法128*960+8720*69
简便法128*960+8720*69

简便法128*960+8720*69
128*960+8720*69
=240*(128*4+109*23)
=240*(512+(100+9)*23)
=240*(512+2300+207)
=240*3019
=240*(3000+19)
=720000+4560
=724560

128*690+8720*69 =128*690+872*10*69 =128*690+872*690 =690*(128+872) =690*1000 =690000 128x690+8720x69=1280x69+8720x69=(1280+