用简便方法计算:1991+199.1+19.91+1.991
来源:学生学帮网 编辑:学帮网 时间:2024/07/01 06:26:50
用简便方法计算:1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
=2000+200+20+2-(9+0.9+0.09+0.009)
=2222-10+0.001
=2212.001
用简便方法计算:1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
=2000+200+20+2-(9+0.9+0.09+0.009)
=2222-10+0.001
=2212.001