Circle the four numbers on the calendar with a square. If the sum of the four numbers is 76, what are the four numbers

Circle the four numbers on the calendar with a square. If the sum of the four numbers is 76, what are the four numbers

Let the first be n
Then the second, third and fourth are n + 1, N + 7, N + 8
So 4N + 16 = 76
n=15
So 15 16 22 23

Finding the negative integer solution of the quadratic equation 3x + 4Y = - 25

3x+4y=-25
3x=-4y-25
x=(-4y-25)/3
y=-1,x=-7
y=-4,x=-3

A total of 100 teachers and students went to plant trees. Each teacher planted 3 trees, and the average student planted 3 trees, just 100 trees. How many teachers and students
Be more accurate

There are x teachers
3x+（100-x）/3=100
9x+100-x=300
8x=200
x=25
100-25 = 75
A: there are 25 teachers and 75 students

1. If x is a rational number and X ≠ 3, simplify x-3 of lx-3l

When x > 3
(x-3)/|x-3|=(x-3)/(x-3)=1
When x

When Xiaohua bought exercise books, the money he paid to the salesperson was more than 1 yuan for 4 copies, but less than 2 yuan for 6 copies. How much did Xiaohua pay to the salesperson? How much is each exercise book?

Unit price: (1 + 2) / (6-4), = 3 / 2, = 1.5 (yuan); Xiaohua pays the salesperson: 1.5 × 4 + 1 = 7 (yuan); answer: Xiaohua pays the salesperson 7 yuan, 1.5 yuan for each exercise book

The solution of the equation x square-4x-5 = 0 is?

5,
-1

From place a to place B, it takes 10 hours for passenger cars and 12 hours for freight cars. After 2 hours for passenger cars from place a to place B, the freight cars start from place B to place a, and then pass through

From place a to place B, it takes 10 hours for the bus and 12 hours for the truck. After 2 hours for the bus to leave from place a to place B, the truck will leave from place B to place A. after a few hours, the two cars will meet?
（1-1/10×2）÷（1/10+1/12）
=4/5÷11/60
=48 / 11 hours

The product of a number and - 4 is one and three fifths. The number is ()
The product of a number and - 4 is one and three fifths. The number is ()
-The quotient of the reciprocal of 1 / 4 and the opposite of 4 is ()
The quotient of two opposite numbers is ()

The product of a number and - 4 is one and three fifths. This number is (- 2 / 5)
-The quotient of the reciprocal of 1 / 4 and the opposite of 4 is (1 / 5)
The quotient of two opposite numbers is (- 1)

The speed ratio of a and B is 2:3. When they meet, a walks 6 km less than B. It is known that B walks for 1 hour and 30 minutes. The speed of a and B and the distance between two places are calculated

Suppose that the speed of a and B is 2xkm / h and 3xkm / h respectively. From the meaning of the question, we get 2x · (112 + 14) = 3x · 32-6, and the solution is x = 6, 2 × 6 = 12km / h, 3 × 6 = 18km / h, 12 × (112 + 14) + 18 × 32 = 21 + 27 = 48km. A: the speed of a and B is 12km / h and 18km / h respectively, and the distance between the two places is 48km

How to calculate 2640 / 2x = (2640 / x) - 2 * 60

2640/2x=(2640/x)-2*60
2640/2x=(2640/x)-120x/x
1320=2640-120x
120x=1320
x=11