简算:999×7.78+333×6.66≡ 5.97×2.6+0.597×75-597×0.001

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/09 03:40:41
简算:999×7.78+333×6.66≡ 5.97×2.6+0.597×75-597×0.001

简算:999×7.78+333×6.66≡ 5.97×2.6+0.597×75-597×0.001
简算:999×7.78+333×6.66≡ 5.97×2.6+0.597×75-597×0.001

简算:999×7.78+333×6.66≡ 5.97×2.6+0.597×75-597×0.001
5.97x2.6+0.597x75-597x0.001
=5.97x2.6+5.97x7.5-5.97x0.1
=5.97x(2.6+7.5-0.1)
=5.97x10
=59.7
999*7.78+333*6.66
=999*7.78+333*3*2.22
=999*7.78+999*2.22
=999*(7.78+2.22)
=999*10
=9990