0.12+0.23+0.34.+0.89=
1个回答
(0.12+0.89)*8/2=1.01*4=4.04
等差数列
相关问题
简便运算;0.12+0.23+0.34+……+0.89=
0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89=?
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.23+0.12+0.34)×(0.12+0.23
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23
计算:(1)0.••01+0.••12+0.••23+0.••34+…+0.••78+0.••89;(2)0.0•1+0