5 / 6 × 1 / 13 + 5 / 9 × 2 / 13 + 5 / 18 × 6 / 13 (simple calculation) （2+4+6······+2000）-（1+3+5······+1999）

5 / 6 × 1 / 13 + 5 / 9 × 2 / 13 + 5 / 18 × 6 / 13 (simple calculation) （2+4+6······+2000）-（1+3+5······+1999）

5/6*1/13+5/9*2/13+5/18*6/13
=5/6*1/13+10/9*1/13+5/3*1/13
=（5/6+10/9+5/3）*1/13
=65/18*1/13
=5/18

Simple and convenient method of 6 / 7 minus 6 / 7 multiplied by 1 / 2

6/7-6/7x1/2
=6/7x(1-1/2)
=6/7x1/2
=3/7

How to calculate 10.1 times 4.26 minus 42.6
I want it now

10 times 4.26 minus 42.6 plus 0.1 times 4.26 equals 0.1

(1 / 3 plus 1 / 4 minus 1 / 36) times 36? (simple algorithm)

(1 / 3 + 1 / 4 minus 1 / 36) times 36
=1/3×36+1/4×36-1/36×36
=12+9-1
=20

(2890 + 5 / 6 + 7 / 8 + 7 / 10) / (5 / 6 + 7 / 8 + 7 / 10) the final answer is 120

(2890 + 5 / 6 + 7 / 8 + 7 / 10) / (5 / 6 + 7 / 8 + 7 / 10)
=1 + 2890 / (5 / 6 + 7 / 8 + 7 / 10)
=1+2890*120/（100+105+84）
=1+2890*120/289
=1+1200
=1201

Simple operation: (7 / 3-3 / 5) △ 7 / 5 / 8 / 5 △ 5 / 3 + 3 / 5 × 3 / 8

(7 / 3-3 / 5) △ 7 / 5
=（7/3-3/5）×5/7
=7/3×5/7-3/5×5/7
=5/3-3/7
=26/21
5 / 8 △ 5 / 3 + 3 / 5 × 3 / 8
=5/8×3/5+3/5×3/8
=3/8+3/5×3/8
=3/8×（1+3/5）
=3/8×8/5
=3/5

(2890 + 5 / 6 + 7 / 8 + 7 / 10) / (5 / 6 + 7 / 8 + 7 / 10) simple operation

（2890+5/6+7/8+7/10）÷（5/6+7/8+7/10）
=2890÷（5/6+7/8+7/10）+1
=2890÷289/120+1
=1200+1
=1201

If the difference between 3 and a certain number is less than 11, how to make an equation? If the difference between 3 and a certain number is less than 11, how to make an equation? If the difference between 3 and a certain number is less than 11, how to make an equation?

3-x=x-11
x=7

A number divided by 36, quotient 31 more than 13, what is the number

31*36+13=1129

[mathematics] 8 / 9 of a number is 8 / 15. What is the number? What is the quotient of 5 / 14 divided by the product of 1 / 2 and 4 / 7?
The ratio is 0.25:10

(1) Let this number be X
8/9x=8/15
x=8/15*9/8
x=3/5
(2)5/14÷（1/2*4/7）=5/4
The answer is not easy. Please accept me!