0.2+0.4+0.6+0.8+0.10+0.12+0.14+…+0.98=
4个回答
0.2+0.4+0.6+0.8=2
下面考虑0.10+0.12+.+0.98
为a1=0.10,an=0.98的等差数列,n=45,则s45=45*a23=45*0.54=24.3
故总和为26.3
相关问题
求下面算式的和:0.1+0.2+0.3+...+0.8+0.9+0.12+0.14+0.16+...+0.98
0.10+0.11+0.12.+0.98+0.99
4:( )=8 ( ):9=2 ( ):10=0.2 6:( )=0.5 ( ):18=0.5 ( ):14=2
口算 0.7×0.8= 0.75÷0.15= 7.6÷10= 0.65×8= 0.2-0.02= 4.8÷12= 0.9
计算0.1+0.2+0.3+0.4+0.5+0.6+0.7+0.8+0.9分之1-2+3-4+5-6+7-8+8-10
0.1+0.2+0.3+0.4+0.5+0.6+0.7+0.8+0.9+0.10+0.11········0.29+0.
口算下面各题. 0.7+2.8= 7.3-0.6= 0.84÷0.2= 0.12×0= 0.4×0.05= 0.5÷10
(2-0.1*3)+(4-0.1*5)+(6-0.1*7)+(8-0.1*9)+(10-0.1*11)+(12-0.1*
数列(第6题3小题)计算0.1+0.2+0.3+0.4+0.5+0.6+0.7+0.8+0.9+0.11+0.12+0.
1. 0.4y^2+0.8y-1=0 2. 6x^2-x-12=10