Simple calculation of 35 * 24

Simple calculation of 35 * 24

35*24＝5*7*3*8＝5*8*（3.7）＝40*21＝840

Simple calculation of 7.24 * 0.25

7.24*0.25=1.81*(4*0.25)=1.81

How to convert a decimal into a fraction? For example, 0.13 1.26 0.88

First, multiply and divide the original number by the same number (10 or 100 or 1000, etc.) at the same time, so that each number has no decimal point, and then simplify it
For example: 0.13 = 0.13 * 100 / 100 = 13 / 100

How to use formula 4.03/12.5

4.03 / 12.5
= (4.03×8) / (12.5×8) 12.5×8 = 25 ÷2×8 = 25 ×4 = 100
= (4.03×8) / (12.5×8)
= 32.24 /100
= 0.3224

Fill in "+" or "-" in the formula to make the equation hold. 9876543221 = 21, 9876554321 = 23, 5555 = 1,

9 - 8 + 7 + 6 + 5 - 4 + 3 + 2 + 1 = 21,9 + 8 - 7 + 6 - 5 + 4 + 3 + 2 + 1 = 21,9 + 8 + 7 + 6 - 5 - 4 - 3 + 2 + 1 = 21,9 - 8 + 7 + 7 + 6 + 5 + 4 - 3 + 2 + 1 = 23,9 + 8 - 7 + 6 + 5 - 4 + 3 + 2 + 1 = 23,5 = 1, only fill in "+. -" impossible 5 + (5 - 5) × 5 = 1

1 + 2 + 3 + 4 + 5 + 6. + 99 + 100
I know that two is 99 divided by 2 times 100 + 100, and the second is 100 + 1 times 100 divided by 2. What's the logic of these two

Suppose the sum is C, then C = 1 + 2 + 2 + 3 +... + 99 + 100 = 100 + 99 +... + 2 + 1, then 2C = (1 + 100) + (2 + 99) + (3 + 98) +... + (55 + 56) +... + (56 + 55) +... + (98 + 3) + (99 + 2) + (100 + 1) = 101 + 101 +... + 101 + 101 = 101 × 100 = 10100, and finally C = 101 × 100 / 2 = 5050

How easy is it to multiply the formula by 7 out of 13

12/13×3/7＋4/7………… It's easy to change
=9/13×4/7＋4/7
=4/7×（9/13＋1）
=4/7×9/13
=88/91

Formula (1 + 1 / 2 + 1 / 3... + 1 / 20) + (1 + 2 / 3 + 2 / 4 + 2 / 5.. + 2 / 20) +. + (1 + 18 / 19 + 18 / 20) + (1 + 19 / 20)
The result! I'm 220

The original formula = (1 / 1 + 1 / 2 + 1 / 3 +,,, + 1 / 20) + (2 / 2 + 2 / 3 +,,, + 2 / 20) +,,, + (18 / 18 + 18 / 19 + 18 / 20) + (19 / 19 + 19 / 20) = (1 + 2 +,, + 19) / 20 + (1 + 2 +,, + 18) / 19 +,,, + (1 + 2 + 3) / 4 + (1 + 2) / 3 + 1 / 2 + 1 * 20 = {(1 + 19) * 19 / 2} / 20

What is the formula of 20 △ 0.3 △ 0.4 △ 0.5 △ 0.6 △ 0.7

20÷（2÷0.3）÷（3÷0.4）÷（4÷0.5）÷（5÷0.6）÷（6÷0.7）=20÷2×0.3÷3×0.4÷4×0.5÷5×0.6÷6×0.7=10×(0.3÷3)×(0.4÷4)×(0.5÷5)×(0.6×6)×0.7=10×0.1×0.1×0.1×0.1×0.7=0.001×0.7=0.0007...

Simple calculation: (8 / 9 + 10 / 7 + 6 / 11) / (3 / 11 + 5 / 7 + 4 / 9)

(8 / 9 + 10 / 7 + 6 / 11) / (3 / 11 + 5 / 7 + 4 / 9) how to do it
=2×(4/9+5/7+3/11)÷(4/9+5/7+3/11)
=2
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