0.7+9.7+99.7+999.7+9999.7+99999.7+999999.7+9999999.7+99999999.7+999999999.7=

0.7+9.7+99.7+999.7+…+999999999.7=? 0.7+9.7+99.7+999.7+9999.7+99999.7+999999.7+9999999.7+99999999.7+999999999.7= 9.7+99.7+999.7+9999.7+99999.7简算 简算9.7+99.7+999.7+9999.7+99999.7谢谢了,大神帮忙啊 7*0.7/9简算 70-（10.1+9.9+9.8+9.8+9.7+9+10. 9 10.3 10.1 9.7 的标准差 9 10 8 10 9 10 7 9的方差 10+9.9-9.8-9.7+9.6+9.5-9.4-9.3+...+0.8+0.7-0.6-0.5+0.4+0.3-0.2-0.1怎么解这题 19.94+99.7×99.8 9.7*0.47+1.53*9.7-9.7(简便计算) 9.7×98-9.7+9.7×3简便运算 0.7（x加9）等于42 999.6+999.7+999.8+1000.8+1000.7+1000.6简便运算 12.5×9.7-12.5×8.7 0.125×0.25×8×4 2.73×99 7.6+7.6×12.5×9.7-12.5×8.70.125×0.25×8×42.73×997.6+7.6×9用简便计算 0.7÷9+1.1÷9+0.3×9简算 巧算 99.6+99.8+99.7+99.1 19.94+99.7×99.8 help me 找规律的数学题-1.3/4.-5/9.7/16.-9/25.第N个数是