1 divided by () > 1 2 divided by () > 2 3 / 5 divided by () > 3 / 5 1 divided by ()

1 divided by () > 1 2 divided by () > 2 3 / 5 divided by () > 3 / 5 1 divided by ()

To divide (a number greater than one) by one

-1-2 and 1 / 3 + 4 and 1 / 5 divided by (- 3) divided by (- 3 / 5)

- 1-2 and 1 / 3 + 4 and 1 / 5 ^ (- 3) ^ (- 3 / 5)
= - 1-2 and 1 / 3 + 21 / 5 × 1 / 3 × 5 / 3
= - 1-2 and 1 / 3 + 2 and 1 / 3
＝﹣1.

A number, divided by 3 to 1, divided by 5 to 2, divided by 7 to 3, how many such numbers (less than 2012)

The minimum number is: 52
2012÷52≈38.69
So there are 38 such numbers

The sum of the four numbers of a, B, C, D does not exceed 200, and a divided by B is equal to 2 and more than 2, a divided by C is equal to 3 and more than 3, and a divided by D is equal to 4 and more than 4. Find the sum of the four numbers of a, B, C, D
This is a fifth grade mathematical problem, of course, with junior high school knowledge can do, the Internet also has the answer to this problem, but how can a primary school student understand it?

A = 2, B + 2,
A = 3, C + 3,
A = 4, D + 4,
A is the least common multiple of 2,3,4 and the multiple of 12
A = 12, B = 5, C = 3, d = 2;
A = 24, B = 11, C = 7, d = 5; a + B + C + D = 47
A = 36, B = 17, C = 11, d = 8; a + B + C + D = 72
A = 48, B = 23, C = 15, d = 11; a + B + C + D = 97
A = 60, B = 29, C = 19, d = 14; a + B + C + D = 122
A = 72, B = 35, C = 23, d = 17; a + B + C + D = 147
A = 84, B = 41, C = 27, d = 20; a + B + C + D = 172
A = 96, B = 47, C = 31, d = 23; a + B + C + D = 197, then a is not satisfied

2. 5, 9, 12 / 3, 7, 11, 16 count 36 points! Hope Gaoren can solve it in an hour!

Sorry for being late!
There are four ways!
9/(5-2)*12=36
9*12/(5-2)=36
12/(5-2)*9=36
12*9/(5-2)=36
There are 8 ways!
3*(7-11+16)=36
3*(7+16-11)=36
3*(16+7-11)=36
3*(16-11+7)=36
(7-11+16)*3=36
(7+16-11)*3=36
(16+7-11)*3=36
(16-11+7)*3=36

Calculation: 2 / 7 + 3 / 9 =

2/7＋3/9＝6/21+7/21=13/21

What is the simple operation of 305 * 52

305*52=（300+5）*52=300*52+5*52=300*（50+2）+5*（50+2）=300*50+300*2+5*50+5*2
=15000+600+250+10=15860

Simple calculation of 52 * 102

52*102=52*(100+2)=52*100+52*2=5200+104=5304

101 × 52 - 52

52 items were extracted from both items
101×52-52
=(101-1)×52
=100×52
=5200
If you don't understand, you can continue to ask this question
Please select it as a satisfactory answer in time,

The standard deviation of data 50,51,52,53,54 is

The answer is 2
The average of 50, 51, 52, 53 and 54 is 52
Then subtract the average from each number, calculate the square of the difference, and add it up again. That's right!