1.99999+1.9999+1.999+1.99+1.9

1.99999+1.9999+1.999+1.99+1.9 1.9+1.99+1.999+1.9999+1.99999+1.999999的简便运算 简便计算; 1.9+1.99+1.999+1.9999+1.99999 28*1111+9999*8 1.9+1.99+1.999简便计算 9999+1.999+1.99+1.9等于多少 1.1+1.3+1.5+1.7+1.9+1.11……+1.97+1.99. 1.1+1.3+1.5+1.7+1.9+1.11+1.13+1.15+1.17+1.19+1.21+.+1.99 证明1.99999.等于2 1.9999x7+1111x37 1.1111×1.9999-0.1111×0.9999 0.1999+1.999+19.99+199.9 1.99^2-1.98*1.99+0.99^2