2.6×9.9的简便计算
2.6×9.9的简便计算
2.6x9.9=2.6x(10-0.1)=26-0.26=25.74
9.98×9.9、2.6×9.8和6.28×9.9+0.628的简便计算
9.98×9.9
=9.98×(10-0.1)
=99.8-0.998
=98.802
2.6×9.8
=2.6×(10-0.2)
=26-0.52
=25.48
6.28×9.9+0.628
=6.28×(9.9+0.1)
=6.28×10
=62.8
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228×9.9的简便计算
228×9.9
= 228x(10-0.1)
= 228x10- 228x10
=2280-22.8
=2257.2
4.5×9.9的简便计算
=4.5×(10-0.1)
=4.5×10 - 4.5×0.1
=45 - 0.45
=44.55
3.25×9.9的简便计算
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3.25×9.9
=3.25×(10-0.1)
=3.25×10-0.325
=32.5-0.325
=32.175
9.9×11的简便计算
9.9*11=(10-0.1)*11=10*11-0.1*11=110-1.1=108.9
80.1*9.9=?的简便计算
80.1*9.9
=(80+0.1)*(10-0.1)
=800+1-8-0.01
=792.99
3.69×9.9的简便计算
3.69×9.9
=36.9-0.369
=36.531
5.5×9.9的简便计算
5.5 x (10 - 0.1) = 55 - 0.55
6.96×9.9的简便计算
6.96×9.9
=6.96x10-6.96x0.1
=69.6-0.696
=68.904
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