Calculation by simple method: - 3.14 × 35.2 + 6.28 × (- 23.3) - 1.57 × 36.4=______ ．

Calculation by simple method: - 3.14 × 35.2 + 6.28 × (- 23.3) - 1.57 × 36.4=______ ．

The original formula = - 3.14 × 35.2 + 3.14 × (- 46.6) - 3.14 × 18.2 = - 3.14 (35.2 + 46.6 + 18.2) = - 3.14 × 100 = - 314

A simple algorithm of 6 × 1.6 + 28.8 × 36.8-14.4 × 80

6×1.6＋28.8×36.8－14.4×80
=6×1.6+14.4×73.6-14.4×80
=6×1.6-14.4×（80-73.6）
=1.5×6.4-14.4×6.4
=6.4×（1.5-14.4）
=-6.4×12.9
=-82.56

- 3.14 × 35.2 + 6.28 × (– 23.3) - 1.57 × 36.4 the idea of simple operation
–3.14×35.2+6.28×（–23.3）-1.57×36.4
The idea of simple operation (write the answer by the way, hee hee)

–3.14×35.2+6.28×（–23.3）-1.57×36.4
=1.57（-70,4-93.2-36.4）
=1,.57*(-200)
=-314
Hope to adopt!

Number reasoning: 4,11,27,61, (), numbers in brackets should be

131
4 times 2 + 3 11
11 times 2 + 5 27
27 times 2 + 7 61
131 times 2 + 61

Digital reasoning:
16 27 36 48 （）
A.34 B.49 C.62 D.72
Which one?

62

Is 64 - 48 36 - 27 an equal ratio sequence?

-48÷64=-3/4
36÷（-48）=-3/4
（-27）÷36=-3/4
So it's an equal ratio sequence
Have a good time

Turn the following fractions into the simplest fractions: 16 out of 18, 45 out of 60, 24 out of 36, 27 out of 117, 125 out of 27400, 48 out of 64

16 out of 18 = 8 / 9
45 out of 60 = 3 / 4
24 out of 36 = 2 / 3
27 out of 117 = 3 / 13
125 out of 400 = 5 / 16
48 out of 64 = 3 / 4

18,20,23,25,27,28,28 () which number should be filled in brackets and why

26
Thought for a long time. I don't know the answer, right
The difference between the latter and the former is 2,3,2,2,1,0 respectively
Because 2 + 2-3 = 3 3 + 2-2 = 3 2 + 2-1 = 3 2 + 1-0 = 3, we deduce 1 + 0 - (- 2) = 3, so the number filled in should be - 2 different from 28
So it's 26

(- 66) * [1 and 21 / 22 - (1 / 3) + - 5 / 11]

(- 66) * [1 and 21 / 22 - (1 / 3) + - 5 / 11]
=（-66）*【43/22-1/3-10/22】
=（-66）*【33/22-1/3】
=（-66）*【（99-22）/66】
=（-66）*【77/66】
=-77

1 * 2 * 3 / 1 + 2 * 3 * 4 / 1 + 3 * 4 * 5 / 1 + ······ + 20 * 21 * 22 / 1
simple and convenient

1 / N (n + 1) (n + 2) = 1 / 2x (1 / N (n + 1) - 1 / (n + 1) (n + 2))... The split term is cancelled. Finally, it is equal to 1 / 2x (1 / 2-1 / 21x22)