Who can solve this math problem, and can you solve this math problem?

Obviously, this question has entered a logical misunderstanding, 28 days a total of 128 yuan, you can indeed find the average cost per day, but the premise is that 3 people are together from the beginning, otherwise in the first 3 days of A living in, the consumption should be yuan, but according to the logic of the original question, only need to calculate the yuan, B lived in the first 10 days, should consume 45 yuan, but the same calculation is only 3 * 10 = 30 yuan, there is no problem after living in, so find out where the price difference is, I hope it helps.

Instead of dividing 128 by 28, you should divide 128 by the total number of days of your three, and then multiply by your respective days, which is the amount of utility bills you each have to pay 128 divided by 68 equals, you should pay yuan, A should pay, B should pay yuan, so that's right.

Solution: In this problem, the reason for the less 26 yuan is: when you use 128 28, everyone lives for 28 days by default.

The specific explanation is: the three days you live longer than A should be counted as yuan, only counting yuan days, and you and A live more than B only counting 3 yuan days. So it's 26 yuan less.

If you want to be fair, then do the math like this: take the sum of the number of days each person stays as the number of servings, i.e., 28 + 25 + 16 = 68

You: 128 68*28=

A: Meta. B: Meta.

。The three days you live longer than A should be counted as yuan, and only three yuan will be counted as yuan, and in the same way, you and A will only be counted as 3 yuan if you live more.

It should be that you live for 28 days a25 days b 15 days a total of 68 days you have to pay 128 68*28= a out b out a total of 128 yuan.

128 28 At 28, you assume that everyone stays for 28 days, but apparently not. So 128 (28+25+16) is the first to be shared every day.

It should be calculated like this, you 28 days a25 days b16 days 69 days, 128 69 is about, you should hand over 9 mao 4 in 28 days, a25 days should be 46 yuan 3 mao 8, b16 days should be 29 yuan 6 mao 8.

First of all, ask if it is dormitory living"Friends"Or live "have" These two are very different.

The plus sign here can be seen as a new algorithm.

5-3=2 5+3=8 The result is 289-1=8 9+1=10 The result is 8108-6=2 8+6=14 The result is 2145-4=1 5+4=9 The result is 197-3=4 7+3=10 The result is 410

The value of 410 subtracted by two numbers is placed first, and the value of two numbers added is placed later.

Someone has asked ** before.

Bag A of rice originally weighed x kilograms, and bag B of rice originally weighed y kilograms.

x+y=440

4y=10x/3

x=240y=200

Bag A of rice originally weighed 240 kilograms, and bag B of rice originally weighed 200 kilograms.

If you can't read the equation, look at this.

The sum of the masses of the remaining rice of A and B is called: "A and B leftovers".

A has 1 1 3 2 3, which is exactly 8 13 of A and B, so that A accounts for 8 13 2 3 12 13 of "A and B".In the same way, B accounts for 5 13 1 2 10 13 of "A and B".

Then (A and B) account for 12 13 10 13 22 13 of the "A and B remains". It can be obtained that "A and B are leftover" 440 22 13 260 tons, then A is 260 12 13 240 kilograms.

440-(1/3+1/2)=439 1/6

The result is not allowed to be a score, you can count it yourself!

A + B = 440

A(1-1 3) B(1-1 2)=8 5A+B=440

A = 6 5 B.

6 5 B + B = 440

11 5 B = 440

B = 200 A = 440 - B = 440 - 200 = 240

Set up bag A xkg, bag B 440-xkg

2x/3)/[(440-x)/2]=8/5x=240kg

So bag A is 240kg, and bag B is 200kg

Let bag A of rice x kg, then B is 440-x, and the calculation formula is: 2 3x: (440-x) 2=8:5, and calculate A 240 and B 200 kg.

So there are still 3 28 students in the playground.

Playing football, 3 28*x=6, x=56

There were 56 students in this class. (The result should be divisible by 2, 4, 7.) of).

The undetermined coefficient method is utilized. The following is divided into the following points: a(x-2)+b(x-1)=3x-4 to obtain a+b=3;-2a-b=-4 gives a=-1, b=-2

Divide the right side and the numerator becomes (a+b)x-(2a+b) so a+b=3

2a+b=4

So a=1

Removing the denominator gives 3x - 4 a(x-2) b(x-1), so that x 1 gives a 1, and so x 2 gives b 2.

Problem solving ideas: Master Wang walked to the company 55 minutes earlier than before, so Master Wang walked for a total of 55 minutes. Master Wang walked for 55 minutes.

This is equivalent to 10 minutes of driving in a car.

Solve the problem Master Wang walks x kilometers every small bend.

55 60 ) x = 50 * (10 60) x = 100 1100 (100 11).

Fractions are not easy to play].