It is necessary to use a simple method

It is necessary to use a simple method

Decompose it into "35 / 1 x8x32 / 1 X5 + 35 / 1 x5x32 / 1 x27 = 35 / 5 X32 / 8 + 35 / 5 X32 / 27" and then use the multiplicative distribution law

45 × 12 + 15 × 24 simple calculation,

45×12+15×24
=15x3x12+15x24
=15x36+15x24
=15x（36+24）
=15x60
=900

Simple calculation process: 5 / 24 × 4 / 15 × 12

5 / 24 × 4 / 15 × 12
=4 / 24 × 5 / 15 × 12
=1 / 6 × 1 / 3 × 12
=2 / 3

77 △ 21 simple operation

77 / 21 = 7 * 11 / 3 = 11 / 3 = 3 and 2 / 3

From small to large: 18 out of 17, 1 out of 5, 19 out of 18, 2 out of 8

19 / 18 ＜ 18 / 17 ＜ 5 / 2 ＜ 8 / 7 ＜ 2 / 7

They are 18 out of 17, 1 out of 5 and 2 out of 2, 19 out of 18 and 2 out of 8 and 7 out of 7

5:1,17:18,5:1,8:2

-19 and 18 / 19 × 17

(19+18/19)*17
=(20-1/19)*17
=340-17/19
=339 2 / 19

3 out of 8, 7 out of 12 and 8 out of 15 are arranged from small to large, with 2 out of 6, 2 out of 9 and 2 out of 18
Be accurate

3/8=1/2-1/8
7/12=1/2+1/12
8/15=1/2+0.5/15=1/2+1/30
So, 3 / 8

How much is 3 and 1 / 5 / (+ 3 / 4) - 3 / 4 * (- 2 / 15) + 3 equal to 7 / 15 / (- 4 / 3)?

3 and 1 / (+ 3 / 4) - 3 * (- 2 / 15) + 3 have 7 / (- 4 / 3) = (16 / 5) / (3 / 4) + (3 / 4) * (2 / 15) - (52 / 15) / (4 / 3) = (16 / 5) * (4 / 3) + (3 / 4) * (2 / 15) - (52 / 15) * (3 / 4) = 64 / 15 + 1 / 10-13 / 5 = (128 + 3-78) / 30 = 53 / 30

What's 13 and 5 out of 6 minus 3 out of 4 plus 5 out of 6 minus 7 out of 12

aa5490303,
13 and 5 / 6 - (- 3 / 4) + 5 / 6 - (- 7 / 12)
= 13 and 5 / 6 + 3 / 4 + 5 / 6 + 7 / 12
= 14 and 2 / 3 + 3 / 4 + 7 / 12
＝16