作业帮1.11111*1.99999-0.11111*0.99999
来源：学生作业帮助网 编辑：作业帮 时间：2024/06/30 19:02:59
简便计算; 1.9+1.99+1.999+1.9999+1.99999 28*1111+9999*8
1.9+1.99+1.999+1.9999+1.99999=2-0.1+2-0.01+2-0.001+2-0.0001+2-0.00001=10-0.11111=9.8888928*1111+9999
1.9+1.99+1.999+1.9999+1.99999+1.999999的简便运算
2x6-(0.1+0.01+0.001+0.0001+0.00001+0.000001)=12-0.111111=11.888889
1.99999+1.9999+1.999+1.99+1.9
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
证明1.99999.等于2
四舍五入嘛