1.5*5+6x=14. This conference room is 9 meters long and 6 meters wide. If you use square bricks with a side length of 8 decimeters, how many should you buy at least?

1.5*5+6x=14. This conference room is 9 meters long and 6 meters wide. If you use square bricks with a side length of 8 decimeters, how many should you buy at least?

1.5*5+6x=14.7
7.5+6X=14.7
Subtract 7.5 from the left and right sides of the equation at the same time
7.5+6X-7.5=14.7-7.5
6X=7.2
Divide the left and right sides of the equation by 6 at the same time
6X／6=7.2／6
X=1.2

How to calculate x + 8% x = 257.6 is an equation

x +8% x=257.6
x +0.08x=257.6
1.08x=257.6
x=257.6÷1.08
x=238.52

(6.1 + x) △ 3 = 19 equations, how to calculate?
It's better to be careful. I can read it

Solution:
(6.1+x)÷3=19
6.1+x=57
x=50.9
Please accept!

How to use the equation to calculate 0.6 * X-5 * 1.25 = 0.35

0.6*X-5*1.25=0.35
0.6X-6.25=0.35
0.6X=0.35+6.25
0.6X=6.6
X=6.6/0.6
X=11

2222222222222 (29 17:1:24)
If the solution set of mx-2 is less than 3x + 4 and X is greater than 6 / M-3, then the value range of M is---------

If two of the equations x ^ 2 + (m-2) x + 5-m = 0 are greater than 2, there are three conditions: (1) B ^ 2 - 4ac > 0 (m-2) ^ 2 - 4 (5-m) > 0m ^ 2 > 16m > 4 or m < - 4 (2) if two of the equations are x1, x2. Because both of them are greater than 0, there are: X1 + x2 = 2 - M > 0m

A man bought 138 Russian feet of two kinds of cloth with 540 rubles, including 3 rubles per Russian foot for blue cloth and 5 rubles per Russian foot for black cloth. How many feet did he buy for each of the two kinds of cloth;

According to the meaning of the title:
x+y=138
3x+5y=540
The solution of the equation is: x = 75, y = 63
So, the answer is blue cloth bought 75 feet, black cloth bought 63 feet

a. B. C is a natural number, and a < B, a + B = 888, C-A = 666, then what is the largest value of a + B + C

c-a=666,c=a+666
a+b+c=888+666+a=1554+a
Because B = 888-a is a natural number and a

22222222222 (29 17:1:45)
Take a group photo of a friend. The charge is 2.85 yuan for two stamps and 0.48 yuan for one hand. It is reserved that each person will pay no more than 1 yuan and take a photo. Ask at least several friends who take part in the photo

With x friends, (x ≥ 2)
Then: 2.85 + 0.48 (X-2) ≤ 1 * x
The solution is: X ≥ 3.63
And X is an integer,
So the minimum x is 4
A: at least four friends

There are several groups of positive integer solutions to the equation 4x with square-2xy-12x + 5Y + 11 = 0

The deformation of the original equation is: 4x & # 178; - 2 (y + 6) x + 5Y + 11 = 0,
Then Δ = [- 2 (y + 6)] and#178; - 4 × 4 (5Y + 11) = 4 (Y & #178; - 8y-8),
∵ X and y are all positive integers, ∵ Δ must be the square of a positive integer,
Let Y & # 178; - 8y-8 = P & # 178;, then (y-4) &# 178; = P & # 178; + 24,
Then let P & # 178; + 24 = Q & # 178;,
∴q²－p²=24,
∴﹙q＋p﹚﹙q－p﹚=24,
(Q + P) and (Q-P) are the same as odd and even,
There are only two cases:
(1) Q + P = 12, Q-P = 2, q = 7, P = 5,
(2) Q + P = 6, Q-P = 4, q = 5, P = 1,
｛ Δ = 10 & ｛ 178; or 2 & ｛ 178;, ｛ y = 14 or 6 or 2,
When Δ = 10 & # 178;, y = 14, x = [2 (y + 6) ± Δ] / (2 × 4) = (20 ± 5) / 4 is not a positive integer. In this case, there is no solution. When Δ = 2 & # 178;, y = 6, x = [2 (y + 6) ± Δ] / (2 × 4) = (12 ± 1) / 4 is not a positive integer. In this case, there is no solution. When Δ = 2 & # 178;, y = 2, x = (8 ± 1) / 2 is not a positive integer

95-24×3=8.4x-6.

95-24×3=8.4x-6.1
23=8.4x-6.1
8.4x=23+6.1
8.4x=29.1
x=29.1÷8.4
X = 3 and 13 / 28