1.991+1.992+1.993+...+2.001+2.002+2.003

1.991+1.992+1.993+...+2.001+2.002+2.003 巧算0.991+1.992+2.993+3.994 计算：1.992-1.98*1.99+0.992 (1.992+19.92+199.2)/0.111 简便计算 1.2+1.92+1.992+.+1.99.+1.99..怎样计算 1991＋199.1＋19.91＋1.991 1991+199.1+19.91+1.991=?(简便方法) 简算题1991+199.1+19.91+1.991= 1991＋199.1＋19.91＋1.991 1+1.91+1.991+ …+1.9999991等于多少? 巧算题求解1991+199.1+19.91+1.991 简便运算 2008+200.8+20.08+200.8+1992+199.2+19.92+1.992 2008+200.8+20.08+2.008+199.2+19.92+1.992= (2008+200.8+20.08+2.008+1992+199.2+19.92+1.992)怎么写? 1991+199.1+19.91+1.991+0.1991 怎么简便运算 用简便方法计算：1991+199.1+19.91+1.991 19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算 1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算