9.8 乘1.4怎么简便计算9.8乘 4.8

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9.8 乘1.4怎么简便计算9.8乘 4.8

9.8 乘1.4怎么简便计算9.8乘 4.8
9.8 乘1.4怎么简便计算
9.8乘 4.8

9.8 乘1.4怎么简便计算9.8乘 4.8
.9.8×1.4
=(10-0.2)×1.4
=14-0.28
=13.72
9.8×4.8
=(10-0.2)×4.8
=48-0.96
=47.04

9.8 x 1.4
=1.4 x (7+1)
=1.4 x 8
=11.2

(10-0.2)*1.4=14-0.28=13.729.8乘 4.8=(10-0.2)*4.8=48-0.96=17.04

9.8*1.4
=(10-0.2)*1.4
=10*1.4-0.2*1.4
=14-0.28
=13.72

(10-0.2)*1.4=14-0.28=13.72

9.8×1.4=(10-0.2)×1.4
    =1.4×10-1.4×0.2
=14-0.28
    =13.72