4.9*3.6*0.5简便运算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 05:28:14
![4.9*3.6*0.5简便运算](/uploads/image/f/311273-17-3.jpg?t=4.9%2A3.6%2A0.5%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
1.25*0.25*6.4*0.5=1.25*0.25*0.8*2*4*0.5=(1.25*0.8)*(0.25*4)*(0.5*2)=1*1*1=1
把除法换作乘法,0.25=1/4,所以3.6÷0.25=3.6÷(1/4)=3.6X4=14.4
3.6除以0.125=3600/125=28.8把它们俩同时扩大1000倍
3.6*(3.8+10*0.72)=3.6*(3.8+7.2)=3.6*11=3.6*(10+1)=36+3.6=39.6
4.9×10.1=4.9×(10+0.1)=4.9×10+4.9×0.1=49+0.49=49.49
3.6*1.25-2.5*1.25=1.25x(3.6-2.5)=1.25x1.1=1.25x(1+0.1)=1.25x1+1.25x0.1=1.25+0.125=1.375
3.8×(4.9-3.6)+8.7×3.8=3.8×1.3+8.7×3.8=3.8×(1.3+8.7)=3.8×10=38希望采纳
23.27-4.9+0.73-16.1=(23.27+0.73)-(4.9+16.1)=24-21=3
15.25-3.1+0.75-4.9=(15.25+0.75)-(3.1+4.9)=16-8=8【秋风燕燕为您答题,肯定对】有什么不明白可以对该题继续追问请及时选为满意答案,
5.48+3.6+4.52+6.4=(5.48+4.52)+(3.6+6.4)=10+10=20
14.5*3.6+14.5*7.4-14.5=14.5×(3.6+7.4-1)=14.5×10=145
0.49*5.1+4.9*0.49=0.49x(5.1+4.9)=0.49x10=4.9
6.4*0.25+3.6/4=6.4/4+3.6/4=(6.4+3.6)/4=10/4=2.5
3.6-3.6+6.4+6.4=0+6.4*2=12.8
3.6*17.4+0.36*26=3.6*17.4+3.6*2.6=(17.4+2.6)*3.6=20*3.6=72
2.4/0.5=2.4*2=4.8再问:我打错了是2.4/0.25的简便再答:2.4/0.25=2.4*4=9.6
36.4*0.46+3.6*5.4简便运算=(36+0.4)*0.46+36*0.54=36x0.46+36x0.54+0.4x0.46=36x(0.46+0.54)+0.184=36.184
3.8×2.8+3.6×7.6=3.8×2.8+3.6×2×3.8=3.8×(2,8+7.2)=3.8×10=38
5.83+3.6-4.79=5.83-4.79+3.6=1.04+3.6=4.64
解题思路:本题考察有理数的混合计算,可以利用结合律进行简便计算解题过程: