Current location - Training Enrollment Network - Mathematics courses - Ask a math question
Ask a math question
First, set the original x people, each with a y ball.

One person does not participate in ball distribution, and the extra Y ball is distributed to x- 1. Everyone can be divided into two, then y>2 (x-1); If everyone scores more than 3 points, then y

And x*y=200 1.

therefore

x * 2 *(x- 1)& lt; 200 1, because x is an integer, x

Similarly, x*3*(x- 1)>200 1, x & gt25.

Since 200 1=3*23*29 and X and Y must be integers, X = 29 and Y = 69.

There are 29 people, each with 69 goals.

Two, five thirds

3/2

13/8

8/5

5/3-3/5= 16/ 15

3/2-2/3=5/6

13/8-8/ 13= 105/ 104

8/5-5/8=39/40

Obviously, if Xiaoming regards 5/3 as 3/5, then the change of sum is the largest, minus 16/ 15.

The average decreased (1615) ÷ 4 = 4/15.

Three. Total cost: 52,000 * 0.98+1840 = 52,800 yuan.

The total planned income is: 52,800 * (1+17%) = 61.776 yuan.

Excluding the loss, the actual apple sold is: 52,000 * (1-1%) = 51480 kg.

The price per kilogram of apples is: 61776 ÷ 51480 =1.2 yuan/kg.

4. Let the water consumption of Party A and Party B exceeding 4 tons be X and Y..

The water consumption of Party A is X+4 tons, and that of Party B is Y+4 tons.

(4 * 1.8+X * 3)+(4 * 1.8+Y * 3)= 26.4

(X+4):(Y+4)=5:3

simplify

3X+3Y= 12

3X-5Y=8

subtraction

8Y=4, Y=0.5 tons, and X=3.5 can be obtained by substituting into one of the equations.

The water fee payable by Party A is: 4* 1.8+3.5*3= 17.7 yuan.

The water fee payable by Party B is: 4* 1.8+0.5*3=8.7 yuan.