[solving equation] there are 126 members in the school swimming team, which is one eighth more than before. How many members are there? The quantity relation is as follows______________

Set up: X people
According to the meaning of the question, the equation is as follows
（126-X）= X/8 （1）
Solution equation: x = 112 (person) (2)
Original athletes: 112

The sales revenue of a clothing store was 50000 yuan in January, 60000 yuan in February and 90000 yuan in March. Due to the promotion activities in March, the sales revenue of men's and women's clothing increased by 40% and 64% respectively compared with February. It is known that the total sales revenue of men's and women's clothing in the first quarter was 200000 yuan. Q: how many million yuan were the sales revenue of men's and women's clothing in February?
2. A city launched the afforestation activity of "protecting the mother river". Village a of the city has 1000 hectares of hillside land, the greening rate is 80%, 300 hectares of paddy fields are regarded as green, and the green area of river slope land is 20%. At present, the greening rate of all the land in village a is 60%. How many hectares of river slope land are there? (hint: all the land in village a is composed of hillside land, paddy field and river slope land)

1. February, male X, female y
x+y=6
1.4x+1.64y=9
One dollar
Male = x, female = 6-x
1.4x+1.64(6-x)=9
x=3.5,
y=2.5
2. Set the river slope as X
(0.8*1000+300+0.2x)/(1000+300+x) = 0.6
x=800
1000+300+800=2100

A, B, C three numbers, their sum is 300. Known a than B 50, B than C 20, what is the number of a?

Let C be x, B be 20 + X, and a be 70 + X
x+20+x+70+x=300
x=70
So a is x + 70 = 70 + 70 = 140

The denominator of the equation (1 / 4-x) - 1 = 2 / 6-x should be - multiplied on both sides of the equation

Hello
The denominator of the equation 1 / 4-x) - 1 = 2 / 6-x should be - multiplied by 12 on both sides of the equation
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Number a is 120, number B is one third less than number a, how much is number B? Urgent!

B number
=120×(1-1/3)
=80

If a > 0, b > 0, and 2A + B = 3, then AB = what, what is the maximum value and what is the minimum value?

AB has a maximum
3 = 2a + b ≥ 2√(2ab)
So 0 < ab ≤ 9 / 8
If and only if a = 3 / 4, B = 3 / 2, the equal sign holds
So the maximum value of AB is 9 / 8

1 / 2 of number a is equal to 2 / 3 of number B. the ratio of number a to number B is

Suppose a is 1 and B is a
1/2=2a/3
3=4a
a=3/4
A is better than B 1 △ 3 / 4 = 4 / 3

Let the rank of the coefficient matrix A of the homogeneous equation AX = 0 be r, then the dimension of the solution space of the equations is?

n-r
If the rank of a is r, then the dimension of the range of the linear transformation whose transformation matrix is a is r
The dimension of solution space is the dimension of kernel of linear transformation
From the theorem dimension (range of a) + dimension (kernel of a) = n (order), the dimension of solution space is n-r

Party A, Party B and Party C produce a total of 585 parts. The number of parts produced by Party A is 4 / 5 of that of Party B, and that of Party B is 8 / 9 of that of Party C
Meaning

The number produced by a is the same as that produced by C
4 / 5 × 8 / 9 = 32 / 45
C produced
585 (32 / 45 + 8 / 9 + 1) = 225
B produced
225 × 8 / 9 = 200
A is in production
200 × 4 / 5 = 160

Solve the following equations 1.4x + 3Y = 245x-y = 302.5x + 3Y = 87x-3y + 4
2.5x+3y=8 7x-3y=4

(1) 4X + 3Y = 24 (1) 5x - y = 30 (1) solution (1) + (2) × 3 is 19x = 114, solution x = 6, substituting x = 6 into (1) is y = (24 - 4 × 6) / 3 = 0, so x = 6, y = 0 (2) 2.5x + 3Y = 8 (1) 7x - 3Y = 4 (2) solution (1) + (2) is 9.5x = 12, solution x

[solving equation] there are 126 members in the school swimming team, which is one eighth more than before. How many members are there? The quantity relation is as follows______________