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7.28×99+7.2怎样简便

7.28×(100-1)+7.2 =728-7.28+7.2 =728-0.08 =727.92

7.2×99+7.2×1=7.2×(99+1)=7.2×100=720

7.2*99 =7.2*(100-1) =720-7.2 =112.8

7.8×99+3.9×2的简便计算 7.8×99+3.9×2 =7.8x99+7.8 =7.8x99+7.8x1 =7.8x(99+1) =7.8x100 =780

1、 99.99*1111+33.33*6667 =33.33x3333+33.33x6667 =33.33x(3333+6667) =33.33x10000 =333300 2、 3.6*48+7.2*2.6不用简便了直接算 如果是3.6*4.8+7.2*2.6的话 3.6*4.8+7.2*2.6 =3.6x48+3.6x5.2 =3.6x(4.8+5.2) =3.6x10 =36 如还不明白,请继续...

7.8×99+3.9×2 =7.8×99+7.8 =7.8×(99+1) =7.8×100 =780

=7.2x(100一1) =7.2x100一7.2x1 =720一7.2 =712.8

原式等于 1.72×(99+1)=172 ~回答完毕~ ~结果仅供参考~ ~\(^o^)/~祝学习进步~~~

7.2×99 =7.2×(100-1) =7.2×100-7.2 =720-7.2 =712.8

(1)56×12.5,=7×(8×12.5),=7×100,=700;(2)14.6-(4.6+7.2),=14.6-4.6-7.2,=10-7.2,=2.8;(3)99×99+199,=99×99+99+100,=99×(99+1)+100,=99×100+100,=9900+100,=10000.

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