来自陆肖元的问题
3.89+3.87+3.83+3.85+3.84+3.86+3.88
3.89+3.87+3.83+3.85+3.84+3.86+3.88
1回答
2019-07-15 05:33
3.89+3.87+3.83+3.85+3.84+3.86+3.88
3.89+3.87+3.83+3.85+3.84+3.86+3.88
3.89+3.87+3.83+3.85+3.84+3.86+3.88
=3.83+3.84+2.85+3.86+3.87+3.88+3.89
=3.86×7
=(4-0.14)×7
=28-0.98
=27.02