1.99999+1.9999+1.999+1.99+1.9快来帮我!

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1.99999+1.9999+1.999+1.99+1.9快来帮我!1.99999+1.9999+1.999+1.99+1.9快来帮我!1.99999+1.9999+1.999+1.99+1.9快来帮

1.99999+1.9999+1.999+1.99+1.9快来帮我!
1.99999+1.9999+1.999+1.99+1.9
快来帮我!

1.99999+1.9999+1.999+1.99+1.9快来帮我!
1.99999+1.9999+1.999+1.99+1.9
=2-0.00001+2-0.0001+2-0.001+2-0.01+2-0.1
=10-0.11111
=9.88889

9。88889

......- -！！！！
某位伟人曾发明过计算器这种伟大的东西！！！！！

1.99999+1.9999+1.999+1.99+1.9快来帮我! 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 证明1.99999.等于2 1.1111*1.9999-0.1111*0.9999 1.9999……是纯循环小数吗? 1999+199.9+19.99+1.999 简算 1999+199.9+19.99+1.999+0.1999 1999+199.9+19.99+1.999=? 1999+199.9+19.99+1.999+0.1999 巧算 1.999+19.99+199.9+1999 1.999精确到0.01是多少 1.999精确到0.01是多少 1.999精确到0.01是多少 1.999近似值最大值和最小值 1.999保留二位小数简便运算：1999+199.9+19.99+1.999+2.111 1999+199.9+19.99+1.999+2.111简便运算