(2 / 3 + 1 / 8) * (9 / 1-19) simple calculation

(2 / 3 + 1 / 8) * (9 / 1-19) simple calculation

The normal calculation method is the most simple. Does the owner want to use a different pattern? (2 / 3 + 1 / 8) * (1-9 / 19)
=19/24+10/19
=5/12
Isn't that easy?

Calculate 13 / 9 - (4 / 9-8 / 19) write process

13 out of 9 - (4 out of 9-8 out of 19)
＝（13/9-4/9）+8/19
＝1+8/19
＝27/19

132 and 1 / 130 / 131

Regarding "you" as an addition operation
132 1 / 130 = 131 + 1 1 / 130 = 131 + 131
(131 + 131 / 130) divided by 131 = 1 + 1 / 130 = 1 and 1 / 130

132 1 / 6 times 131 6 / 6

132 1 / 6 times 131 6 / 6
=（131+7/6）×6/131
=131×6/131+7/6×6/131
=6+7/131
=6 and 7 / 131

Compare 178 times 1 out of 132 times (- 3.2) with - 173 times (- 27 out of 164) times 7.2

178 times 1 / 132 times (- 3.2) 0
So 178 times 1 / 132 times (- 3.2)

What is the greatest common factor of 13 and 21?

1

Summation 1 / (1 + 99 ^ 2) + 2 ^ 2 / (2 ^ 2 + 98 ^ 2) + 3 ^ 2 / (3 ^ 2 + 97 ^ 2) + +99^2/(99^2+1^2)

The first fraction is added to the last fraction (the 99th fraction) to get 1
Add the second fraction and the penultimate fraction (i.e. the 98th fraction) to get 1
The third fraction is added to the penultimate fraction (the 97th fraction) to get 1
.
Add the 49th fraction and the 49th from the bottom (i.e. the 51st fraction) to get 1
The 50th score is 50 ^ 2 / (50 ^ 2 + 50 ^ 2) = 1 / 2
So the sum is 49.5

Calculation 1 / 1 * 2 * 3 + 1 / 2 * 3 * 4 + 1 / 3 * 4 * 5 +... + 1 / 98 * 99 * 100

1 / (1 * 2 * 3) = (3-2) / (1 * 2 * 3) = 1 / (1 * 2) - 1 / (2 * 3) similarly, 1 / (2 * 3 * 4) = 1 / (2 * 3) - 1 / (3 * 4) and so on, 1 / 1 * 2 * 3 + 1 / 2 * 3 * 4 + 1 / 3 * 4 * 5 +... + 1 / 98 * 99 * 100 = 1 / (1 * 2) - 1 / (2 * 3) + 1 / (2 * 3) - 1 / (3 * 4) + 1 / (3 * 4) - 1 / (4 * 5) + + 1/(98...

Simple calculation: 17 △ 19 / 7 + 7 △ 19 / 2

=17*7/19+2*7/19
=(17+2)*7/19
=19*7/19
=7

How to do 17 times 1.25 times 16 times 2.5 with simple calculation

17×1.25×16×2.5
=17×1.25×（2×8）×2.5
=17×（1.25×8）×（2×2.5）
=17×10×5
=850