Four of them go to the library to borrow books. A goes every five days, B goes every 11 days, C goes every 17 days, and D goes every 29 days. If they meet in the library on May 18, what month will they meet next? A10.18 b10.14 c11.18 d11.14 A, B, C and d go to the library to borrow books. A goes every five days, B goes every 11 days, C goes every 17 days, and D goes every 29 days. They met on May 18. When will they meet next?

In fact, this problem is to find the least common multiple of 5, 11, 17 and 29. Because they are all prime numbers, their least common multiple is 5 times 11 times 17 times 29. The answer is 27115, 27115 divided by 365, and the remainder is 105. May 18, what is the date of the past 105 days

Students a, B, C and d go to the library to borrow books every other day. A goes to the library once every two days and B goes to the library once every three days

[2,3,4,5] = 60 / 7 = 8 (week). 4 (day) a: at least 60 days. It's Friday

A, B, C and d go to the library to borrow books. A goes every five days, B goes every 11 days, C goes every 17 days,
Ding goes every 29 days. If the four of them meet in the library on May 18, what is the date of the next meeting?

See clearly is "separation"
5,11,17,29 are not right
Should be
The least common multiple of 6,12,18,30 is 180
So 180 days later, November 14

If the solution of the equation 3 / 5-2x = 1 with respect to X is the same as ax + 5 = 10-4a, then a =?

3/5-2x=1
2x=3/5-1
x=-1/5
ax+5=10-4a
ax=10-4a-5
ax=5-4a
x=(5-4a)/a
(5-4a)/a=-1/5
5(5-4a)=-a
25-20a=-a
19a=25
a=25/19

The average number of a, B and C is 230. It is known that 2 / 3 of a is equal to 4 / 5 of B, and C is 3 / 4 more than B. what are the three numbers?

A: B = 4 / 5:2 / 3 = 6:5 = 24:20
B: C = 1: (1 + 3 / 4) = 4:7 = 20:35
A: B: C = 24:20:35
Sum of a, B and C = 230x3 = 690
A = 690 ÷ (24 + 20 + 35) x24 = 16560 / 79
B = 690 ÷ (24 + 20 + 35) X20 = 13800 / 79
C = 690 ÷ (24 + 20 + 35) X35 = 12600 / 79
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Why is N-R (a) the number of fundamental solution system of equations in linear algebra? What is n? Is the number of vector in a column of matrix?

N is the number of unknowns, that is, the number of column vectors,
If you carry out elementary transformation on coefficient matrix A, you will get some linearly related row vectors, which are "random variables". If you can take any value, there are as many "random variables" as there are vectors of basic solution system, that is, you can use the total number of vectors to subtract those linearly independent vectors, that is, the rank of A
This explanation is not very strict, but the image is not very clear~~~~

A batch of parts, a alone 10 hours, B do 15 hours. Now a, B two people processing at the same time, complete the task, a processing 360, how many parts
First, find out the work efficiency ratio of a and B

The work efficiency ratio of Party A and Party B is 15 / 10
360+360/（15/10）=900

It is known that the solution of the system of equations 2x − y = 5kx + y = k about X, y is also the solution of the equation 4x-y = - 9, and the value of K is obtained

To solve the equations 2x − y = 5kx + y = k about X and y, we get x = 2K, y = - K. substituting x = 2K, y = - K into 4x-y = - 9, we get 4 × 2K - (- K) = - 9 and K = - 1

There are 108 tons of chemical fertilizer in two chemical fertilizer warehouses A and B. warehouse A sells 4 / 13 of it and warehouse B sells 1 / 4 of it,
A total of 30 tons of chemical fertilizer were sold in the two warehouses. How many tons of chemical fertilizer were stored in each warehouse

If there were x tons of chemical fertilizer in warehouse A, there would be 108-x tons of chemical fertilizer in warehouse B
4/13*x+1/4*(108-x)=30
x=52
108-52=56
Therefore, there were 52 tons of chemical fertilizer in warehouse A and 56 tons of chemical fertilizer in warehouse B

Solution of the equation X-9 / 7X = 12 / 5

Solution 2 / 9x = 5 / 12
x=5/12×9/2
=15/8

Students a, B, C and d go to the library to borrow books every other day. A goes to the library once every two days and B goes to the library once every three days

A, B, C and d go to the library to borrow books. A goes every five days, B goes every 11 days, C goes every 17 days, Ding goes every 29 days. If the four of them meet in the library on May 18, what is the date of the next meeting?