rpct.net
当前位置:首页 >> 3.2Ⅹ9.9 0.32脱式计算,能简算的要简算 >>

3.2Ⅹ9.9 0.32脱式计算,能简算的要简算

(1)0.8×3.9×1.25=0.8×1.25×3.9=1×3.9=3.9(2)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7(3)0.49×9.9=0.49×(10-0.1)=0.49×10-0.49×0.1=4.9-0.049=4.851(4)60.8-7.18-12.82=60.8-(7.18+12.82)=60.8-20=40.8(5)2.5×3.2×12...

2-6/13÷9/29-2/3 解:根据约分和通分的运用, 原式=2-6/13÷9/29-2/3 =2-6/13x29/9-2/3 =2-58/39-2/3 =2-1-19/39-26/39 =1-45/39 =-6/39 =-2/13

1.9+19点9+199点9+0点3 =2-0.1+20-0.1+200-0.1+0.3 =(2+20+200)-(0.1+0.1+0.1)+0.3 =222-0.3+0.3 =222

4.8x9.9脱式计算能简算要简算 4.8x9.9 =4.8*10-4.8*0.1 =48-0.48 =47.52

原式 =10.1x99-9.9 =10.1x99-0.1x99 =(10.1-0.1)x99 =10x99 =990 供参考。

=(9.9+0.1)×5.5=55

①2.9×1.4+2×1.6,=4.06+3.2,=7.26;②(2.44-1.8)÷0.4×20,=0.64÷0.4×20,=1.6×20,=32;③4.6×9+4.6,=4.6×9+4.6×1,=(9+1)×4.6,=10×4.6,=46.

①1.25×4.8,=1.25×8×0.6,=10×0.6,=6; ②5.5×9.9+0.1×5.5,=(9.9+0.1)×5.5,=10×5.5,=55; ③3.45×102,=3.45×(100+2),=3.45×100+3.45×2,=345+6.9,=351.9;④3.17+0.83×1.6,=3.17+1.328,=4.498.

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