ldcf.net
当前位置:首页 >> 7.2一1.9+2.8 用简便方法计算 >>

7.2一1.9+2.8 用简便方法计算

7.2+2.8-1.9=10-1.9=8.1

2.87215+1.9简便算法: 2.87215+1.9 =2.87215+2-0.1 = 4.87215 -0.1 = 4.77215

37.9-2.8-7.2+2.1 =(37.9+2.1)-(2.8+7.2) =40-10 =30 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

7.9×2.8+2.8×2.1 =(7.9+2.1)×2.8 =10×2.8 =28

1.9*(7.2+2.8)=1.9*10=19

1.1+1.2+1.3+1.4.......+2.5+2.6+2.7+2.8+2.9 =(1.1+2.9)×(29-11+1)÷2 =4×19÷2 =38

(1)12.25-3.1+0.85-6.17=12.25+0.85-3.1-6.17=13.1-3.1-6.17=10-6.17=3.83;(2)(1.9-1.9×0.9)÷(3.8-2.8)=(1.9-1.71)÷(3.8-2.8)=0.19÷1=0.19;(3)2.65×1.7+1.35×1.7=(2.65+1.35)×1.7=4×1.7=6.8;(4)0.125×13.8×32×0.25=0.125×...

2.8×1.9+32.5简便方法怎么算 =2.8x2-2.8x0.1+32.5 =5.6-0.28+32.5 =32.5+6-(0.4+0.28) =38.5-0.68 =38.5-1+0.32 =37.82

2.5×27×0.4 =(2.5x0.4)x27 =1x27 =27; 4.85-(2.1+0.85) =(4.85-0.85)-2.1 =4-2.1 =1.9; 3.2-2.8+6.8-7.2 =(3.2+6.8)-(2.8+7.2) =10-10 =0; 777×9+111×37 =111x7x9+111x37 =111x63+111x37 =111x(63+37) =111x100 =11100. 供参考。

(1)1.25*6.4*7 =1.25*0.8*8*7 =1*56 =56 (2)9.9*7.8+0.78 =99*0.78+0.78 =0.78*(99+1) =78 (3)0.77/0.55 =0.11*7/0.11*5 =7/5 (4)7.5*1.02 =7.5*(1+0.02) =7.5+7.5*0.02 =7.2+0.15 =7.35 (5)3.7*2.8+12.5 =3.7*(3-0.2)+12.5 =11...

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com