9.5*10.1-0.95用简便方法计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/24 07:24:26
10.1*0.99=(10+0.1)*(10-0.1)=100-0.01=99.99
10.1×27=(10+0.1)×27=10×27+0.1×27=270+2.7=272.7
9.9*10.1=9.9*(10+0.1)=99+0.99=99.99
1.01×99+10.1=10.1×9.9+10.1=10.1×(9.9+1)=10.1×10.9=(10+0.1)×10.9=109+1.09=110.09
9.5×10.1=9.5×10+9.5×0.1=95+0.95=95.950.25×3.24×4=(0.25×4)×3.24=1×3.24=3.240.84×1.7÷0.07=0.84÷0.07×1.
=(10+0.1)*0.99=9.9+0.099=9.999再问:不够细致。再问:能再细致点么再答:=(10+0.1)*0.99=10*0.99+0.1*0.99=9.9+0.099=9.999再问:
10.1^2-10.1*2.2+1.21=10.1^2-2*10.1*1.1+1.1^2=(10.1-1.1)^2=9*9=81
4.5×10.1=4.5×(10+0.1)=4.5×10+4.5×0.1=45+0.45=45.450.125×25×32=0.125×25×8×4=(0.125×8)×(25×4)=1×100=10
6.3×10.1=6.3×(10+0.1)=6.3×10+6.3×0.1=63+0.63=63.63再问:7.3*9.9的简便计算再答:7.3×9.9=7.3×(10-0.1)=7.3×10-7.3×
3.94+34.3乘0.2=3.94+6.86=4-0.06+7-0.14=11-0.2=10.84.8乘100.1=4.8*(100+0.1)=4.8*100+4.8*0.1=480+0.48=48
99.9
(101*10.1-10.1)*10.1={10.1x(101-1)}x10.1=10.1x100x10.1=101x101=(100+1)x101=10100+101=10201
9.5-10.1-0.873.143-43.56.5
1.56*10.1-15.6=1.56*(10+0.1)-1.56*10=1.56*10+1.56*0.1-1.56*10=1.56*0.1=0.156
原式=6.3*(10+0.1)=6.3*10+6.3*0.1=63+0.63=63.63
35*10.1=35*(10+0.1)=35*10+35*0.1=350+3.5=353.5
单位不同,不能画等号!
5.12*10+5.12*0.1=51.2+0.512=51.712
此为样本方差首先计算样本均值,样本数为8X=(10.2+10+9.5+10.3+10.5+9.6+9.8+10.1)/8=10S^2=[(10.2-10)^2+(10-10)^2+(9.5-10)^2