早教吧作业答案频道 -->数学-->
几道简算题1用简便方法计算下面各题:1.14/15×82.2/25×1263.35×11/364.73×74/755.1997/1998×1999
题目详情
▼优质解答
答案和解析
1.14/15×8
=(1-1/15)×8
= 8-8/15
= 7又7/15
2.2/25×126
= 2/25×(125+1)
= 10+2/25
= 10又2/25
3.35×11/36
=(36-1)×11/36
= 11-11/36
= 10又25/36
4.73×74/75
= 73×(1-1/75)
= 73-73/75
= 72又2/75
5.1997/1998×1999
= 1997/1998×(1998+1)
= 1997+1997/1998
= 1997又1997/1998
=(1-1/15)×8
= 8-8/15
= 7又7/15
2.2/25×126
= 2/25×(125+1)
= 10+2/25
= 10又2/25
3.35×11/36
=(36-1)×11/36
= 11-11/36
= 10又25/36
4.73×74/75
= 73×(1-1/75)
= 73-73/75
= 72又2/75
5.1997/1998×1999
= 1997/1998×(1998+1)
= 1997+1997/1998
= 1997又1997/1998
看了 几道简算题1用简便方法计算下...的网友还看了以下:
(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+ 2020-04-27 …
1.0.3:12=2.0.25:4=3.2.8:0.7=4.2.1:1.2=5.0.1:0.8=6 2020-07-17 …
一简便运算17/3-(17/3-15/8)9/1+2/1÷5/4+8/25/3×143-43-0. 2020-07-18 …
6÷3/8–3/8÷64/7×5/9+3/7×5/95/2-(3/2+4/5)7/8+(1/8+1 2020-07-18 …
有两箱苹果,第一箱重25千克,第一箱比第二箱的1.5倍少7.5千克,两箱苹果共重多少千克?1.5x 2020-07-19 …
基于先乘除,后加减,请问:基于先乘除,后加减,请问:3)原式=7/6-(2/5+3/5)×5/6= 2020-07-30 …
用不等号填空,并总结规律/(+5)+(+7)//+5/+/+7//(-5)+(-7)//-5/+/ 2020-08-01 …
设非空集合A{1,2,3,4,5,6,7},且当a∈A时必有8-a∈A,这样的A共有(15)个.{ 2020-08-01 …
设非空集合A{1,2,3,4,5,6,7},且当a∈A时必有8-a∈A,这样的A共有(15)个.{4 2020-12-07 …
找规律练习题1=1*11+3=4=2*21+3+5=9=3*31+3+5+7=16=4*41+3+5 2021-01-21 …