12.8 times 34.5 plus 12.8 times 12.3 plus 46.8 times 87.2 =? Simple operation

12.8 times 34.5 plus 12.8 times 12.3 plus 46.8 times 87.2 =? Simple operation

12.8*34.5+12.8*12.3+46.8*87.2=12.8*(34.5+12.3)+46.8*87.2=12.8*46.8+46.8*87.2=46.8*(12.8+87.2)=4680

Simple calculation of 24 × 73 + 26 × 24

24x（73+26）
=24x99
=24x（100-1）
=24x100-24x1
=2400-24
=2376

(1 / 2 + 1 / 3 + 1 / 6) times 24,

(1 / 2 + 1 / 3 + 1 / 6) times 24
=1 / 2 × 24 + 1 / 3 × 24 + 1 / 6 × 24
=12+8+4
=24

If 0.6 times 24 plus 3 / 5 times 76 can be used for simple calculation, it can be used for simple calculation

(1.01-0.09) x0.001

（1.01—0.09)x0.001
=（1.00—0.08)x0.001
=0.92*0.001
=0.0092

7 out of 12 times 2 out of 3
shuanshi

7/12×2/3-2/3×5/12
=2/3×(7/12-5/12)
=2/3×1/6
=1/9
This is my conclusion after meditation,
If not, please ask, I will try my best to help you solve it~
If you are not satisfied, please understand~

It is calculated by a simple method: 1 / 11-5 + 1 / 12 + 1 / 12

1/(11-5) +1/12+1/12
=1/6 +(1/12+1/12)
=1/6 +1/6
=2/6
=1/3

The method is simple and convenient

4/14×9/5+3/5×9/14
=9/14×4/5+9/14×3/5
=9/14×(4/5+3/5)
=9/14×7/5
=9/10

(2 / 11 + 3 / 22 + 4 / 33) × 66 (seeking process)

(2/11+3/22+4/33)×66
=2/11×66+3/22×66+4/33×66
=12+9+8
=29

15, 30, 10, 24, 12, 36, 33, 66, 22, 31, 15.5, 46.5 according to the law, what are the last three numbers? How to find the law?
Please write down your ideas

If the first one is a, then the following three consecutive ones are:
a,2a,(2/3)a
The relationship between the first and the second is: multiply by 2, divide by 2, multiply by 2, divide by 2
The relationship between the second and the third is: divide by 3, multiply by 3, divide by 3, multiply by 3