早教吧作业答案频道 -->数学-->
用简便方法计算下面各题.1.8×0.9+0.185.4×0.68+3.4×2×0.4623.9-0.6×0.6-0.646.82÷4÷0.251.26÷(1.26×0.8)0.7777×0.7+0.1111×2.1.
题目详情
用简便方法计算下面各题.
1.8×0.9+0.18 | 5.4×0.68+3.4×2×0.46 |
23.9-0.6×0.6-0.64 | 6.82÷4÷0.25 |
1.26÷(1.26×0.8) | 0.7777×0.7+0.1111×2.1. |
▼优质解答
答案和解析
(1)1.8×0.9+0.18
=1.8×0.9+1.8×0.1
=1.8×(0.9+0.1)
=1.8×1
=1.8;
(2)5.4×0.68+3.4×2×0.46
=5.4×0.68+6.8×0.46
=5.4×0.68+0.68×4.6
=(5.4+4.6)×0.68
=10×0.68
=6.8;
(3)23.9-0.6×0.6-0.64
=23.9-0.36-0.64
=23.9-(0.36+0.64)
=23.9-1
=22.9;
(4)6.82÷4÷0.25
=6.82÷(4×0.25)
=6.82÷1
=6.82;
(5)1.26÷(1.26×0.8)
=1.26÷1.26÷0.8
=1÷0.8
=1.25;
(6)0.7777×0.7+0.1111×2.1
=0.1111×7×0.7+0.1111×2.1
=0.1111×4.9+0.1111×2.1
=0.1111×(4.9+2.1)
=0.1111×7
=0.7777.
=1.8×0.9+1.8×0.1
=1.8×(0.9+0.1)
=1.8×1
=1.8;
(2)5.4×0.68+3.4×2×0.46
=5.4×0.68+6.8×0.46
=5.4×0.68+0.68×4.6
=(5.4+4.6)×0.68
=10×0.68
=6.8;
(3)23.9-0.6×0.6-0.64
=23.9-0.36-0.64
=23.9-(0.36+0.64)
=23.9-1
=22.9;
(4)6.82÷4÷0.25
=6.82÷(4×0.25)
=6.82÷1
=6.82;
(5)1.26÷(1.26×0.8)
=1.26÷1.26÷0.8
=1÷0.8
=1.25;
(6)0.7777×0.7+0.1111×2.1
=0.1111×7×0.7+0.1111×2.1
=0.1111×4.9+0.1111×2.1
=0.1111×(4.9+2.1)
=0.1111×7
=0.7777.
看了 用简便方法计算下面各题.1....的网友还看了以下:
还是lingo问题road(country,country):length,xie,c;endse 2020-05-13 …
大家快来看看这几道题怎么简算!我急用!0.071*1234+0.71*567.6+7.1*23.4 2020-05-16 …
Matlab;已知u=0:0.1:1;△u=[0.100.1210.130.1410.150.16 2020-06-05 …
为描绘小灯泡的伏安特性曲线,得到下列数据.电流(A):0 0.1 0.2 0.3 0.36 2020-06-27 …
钢材规格1.0*1*2/4*8/c是什么意思啊?不锈钢板规格表1.0*1*2/4*8/C4.0-6 2020-07-09 …
直接写得数.1.2+0.3=4+0.6=12.9-5=12+3.5=0.9+0.7=0.6+1.4 2020-07-19 …
已知xyz三维坐标系上点A(0,0,1),B(1,1,0),C(0,1,0),O(0,0,0),已 2020-07-30 …
求数学达人指教求公式基数为0.21天为0.0+0.2=0.22天为0.2+0.4=0.63天为0.6 2020-11-06 …
语数挑战题:请根据下面数字猜成语1、0000。2、0+0=1。3、1*1=1。4、0+语数挑战题:请 2020-11-20 …
应该是等差数列的一到问题有追加分0.1,0.2,0.4,0.7,1.1,1.6,2.2.求第1000 2020-12-24 …