2.5*13 0.9 简便运算
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/14 18:32:30
1.25×32×2.5=1.25×8×4×2.5=(1.25×8)×(4×2.5)=10×10=100
13.5*2.5-0.35*25=1.35*25-0.35*25=(1.35-0.35)x25=1x25=25
2.5+0.75÷1.5-2.25=2.5+3/4÷3/2-2.25=2.5+3/4×2/3-2.25=2.5+0.5-2.25=0.75
2.5×(100+2)-55=200
等于20乘2.5+0.25-0.25等于50再答:请采纳再问:用数字再答:等于20x2.5+0.25-0.25等于50再问:脱式再答:4.75加0.25等于5再问:简便运算再问:不简便再答:这就不简便
(2.5*0.4)*(0.8*12.5)=1*10=10
12.5×0.76×6.4×2.5×0.5=(12.5×0.8)×0.76×(4×2.5)×(2×0.5)=10×0.76×10×1=76
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
88.4*2.5-22.4/0.4=88.4*2.5-22.4÷2/5=88.4*2.5-22.4*2.5=(88.4-22.4)*2.5=60*2.5=150
12.8×0.75+2.5×1.28=1.28×7.5+1.26×2.5=1.28×(7.5+2.5)=1.28×10=12.8
提取1.251.25*(6.66+2*33)不懂就问哈再问:2.2×0.25+0.5×1.1的简便运算
75*0.82+2.5*8.2=75*0.82+25*0.82=0.82(75+25)=8213.75+45÷1.8*25=13.75+45÷45=13.75+1=14.7512.5*4.8÷1.5÷
3.64×4×2.5=3.64
0.25×6.3+2.5×0.37=0.25×6.3+0.25×3.7=0.25×(6.3+3.7)=0.25×10=2.5
7.5×27+19×2.5=2.5×3×27+19×2.5=2.5×81+19×2.5=2.5×(81+19)=2.5×100=250
4.6×0.75+0.46×2.5=4.6×0.75+4.6×0.25=(0.75+0.25)×4.6=1×4.6=4.6
16/2.5=(16*2)/(2.5*2)=32/5=(30+2)/5=30/5+2/5=6又2/5
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: