0.8+0.88= 0.8+0.88+0.888= 0.8+0.88+0.888+0.8888= 0.8+0.88+0.
0.8+0.88= 0.8+0.88+0.888= 0.8+0.88+0.888+0.8888= 0.8+0.88+0.
0.8+0.88+0.888+0.8888+0.2222(简便)
0.8+0.88+0.888+0.8888+0.88888+0.888888
0.8,0.88,0.888.求通项公式
数列0.8,-0.88,0.888,-0.8888的通项公式
0.8,0.88,0.888,0.8888.的通项公式.谢
求数列 0.8,0.88,0.888…的通项公式
0.2+0.4+0.6+0.8+0.10+0.12+0.14+……+0.98(用最简便的方法计算)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20 =
10-9.8+9.6-9.4+9.2-9+...+0.8-0.6+0.4-0.2
0.8×(12.5+1.25)的简便计算
(12.5+1.25)×0.8简便计算.