n个9乘以n个9加上 6.5乘以2.3加上6.5乘以6.7加上6.5的简便计算方法是怎样的？

6.5乘以2.3加上6.5乘以6.7加上6.5的简便计算方法是怎样的？  

6.5乘以2.3加上6.5乘以6.7加上6.5的简便计算方法是怎样的？

原式
=6.5x2.3+6.5x6.7+6.5
=6.5x(2.3+6.7+1)
=6.5x(9+1)
=6.5x10
=65

(5.8乘以0.4加上7.5乘以0.4）的简便计算方法是什么?

从后面往前面运算要快一点！

0.13乘以98加上1.3乘以0.2简便计算方法

0.13乘以98加上1.3乘以0.2
=0.13×98+1.3×0.2
=1.3×9.8+1.3×0.2
=1.3×（9.8+0.2）
=1.3×10
=13

7.9乘以4.5加上79乘以0.55的简便计算方法

7.9X4.5+79X0.55
=7.9X4.5+7.9X5.5
=7.9X(4.5+5.5)
=7.9X10
=79

1.999乘以2014加上1.999乘以2015的简便计算方法

1.999×2014+1.999×2015
=1.999×（2014+2015）
=1.999×4029
=（2-0.001）×4029
=2×4029-0.001×4029
=8058-4.029
=8053.971

6.5减去6.5乘以0.8简便计算方法算式

6.5减去6.5乘以0.8简便计算方法算式
6.5-6.5*0.8
=6.5-（1-0.8）
=6.5*0.2
=1.3

12.3乘以6.5加7.7乘以6.5的简便计算

12.3乘以6.5加7.7乘以6.5
=12.3x6.5+7.7x6.5
=6.5x(12.3+7.7)
=6.5x20
=130

6.5×1.1的简便计算方法是怎样的

6.5×1.1
=6.5×(1+0.1)
=6.5×1+6.5×0.1
=6.5+0.65
=7.15

75乘以99加上2乘以75的简便计算方法与实习

原式=75x(99+2)
=75x101
=75x(100+1)
=75x100+75x1
=7500+75
=7575

87乘以24减去24加上37的简便计算方法是什么?

87×24-24+37
=88×24-11
=11（8×24-1）
=11×（200-9）
=2101