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3.8×1.2+18.9÷0.9怎么简便计算

:3.8x1.2+18.9÷0.9 =3.8X1.2+18.9X10/9 =3.8X1.2+21 =4.56+21 =25.56

3.8×1.2+18.9÷0.9 有没有简便计算 解:3.8×1.2我们能否看作:1个3.8+0.2个3.8=3.8×0.76=4.25吗? 18.9÷0.9 我们能否看作:两边同时扩大10倍,则18.9×10÷0.9×10=189÷9=21吗?则此式的计算成了:(3.8+0.2×3.8)+(18.9×10÷0.9×10)=4.25...

=3.8*1.2+18.9/0.9 =3.8*1.2+21 =(4-0.2)*1.2+21 =4.8-0.24+21 =25.8-0.24 =25.56

直接是不能简算。 @

2.9+9×(21-18.1)用简便的方法计算 =2.9+9x2.9 =2.9x(1+9) =2.9x10 =29

18/35÷0.9×2/3 =18/35×10/9×2/3 =8/21 12÷3/10×50% =12×10/3×1/2 =20 2-6/13÷3/26-2/3 =2-6/13×26/3-2/3 =2-4-2/3 =-(4-2/3-2) =-1又1/3

18.9×178+178×2.1-178 =178x(18.9+2.1-1) =178x20 =3560 希望能帮到你!

9/13×(13/18)+1/3×(1/2) =1/2+1/3*1/2 =(1/3+1)*1/2 =4/3*1/2 =2/3

(1)-2+7-18+9=(-2-18)+(7+9)=-20+16=-4;(2)17-8÷(-2)2+4×(-3)=17-8÷4+4×(-3)=17-2+(-12)=3;(3)(59?34+118)×36=59×36?34×36+118×36=20-27+2=-5;(4)?492627×3=(?50+127)×3=?50×3+127×3=?150+19=?14989.

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