27.9×9.9+2.79 简便计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 04:28:08
![27.9×9.9+2.79 简便计算](/uploads/image/z/131478-6-8.jpg?t=27.9%C3%979.9%EF%BC%8B2.79+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
27.9×9.9+2.79 简便计算
27.9×9.9+2.79 简便计算
27.9×9.9+2.79 简便计算
27.9×9.9+2.79
=27.9×9.9+27.9×0.1
=27.9×(0.1+9.9)
=27.9×10
=279
=2.79×99+2.79
=2.79×(99+1)
=2.79×100
=279
27.9*(9.9+0.1)=279
27.9x9.9+2.79
=27.9x9.9+27.9x0.1
=(9.9+0.1)x27.9
=10x27.9
=279
27.9×9.9+2.79
=27.9×9.9+27.9×0.1
=27.9×(9.9+0.1)
=27.9×10
=279
27.9×(10-0.1)+2.79