Are there many motifs to solve classical equation problems in the first grade?

Given |5x-3|=3-5x, find the value range of x.

Because |5x-3| >=0

SO3-5X & gt； =0

5X<=3

X & lt=3/5

1. The sum of x and y values satisfying the equation 3X+5Y=K+ 1 is 2. Find the value of k..

2X+3Y=K

2. Solve the equation: X+Y-Z=Z-2Y=A-6X=- 1.

3. Solve application problems with equations (groups).

The water supply company stipulates that the water fee is charged in the following ways: "If the monthly water consumption of each household does not exceed 40 tons, each ton of water will be charged at 1 yuan; If the monthly water consumption of each household exceeds 40 tons, the excess will be charged per ton 1.5 yuan. In addition, 0.2 yuan city sewage treatment fee is charged for each ton of water. The charging office of the water supply company stipulates that users pay the water fee every two months. (Note: Water consumption fee = water fee = urban sewage treatment fee)

An enterprise uses more than 40 tons of water every month, and it is known that it will pay the water fee in March and April this year. 660 yuan asked: How many tons of industrial water did enterprises use in March and April? What is the average water fee per ton in these two months?

4. If you specify two numbers A and B as※, you will get 4AB, for example, 2※6=4×2×6=48.

No matter what number x is, there is always a ※X=X to find the value of a.

5. In the first eight rounds of Group A in a certain year, a football team remained unbeaten in a row, with 23 points. According to the rules of the game, if it wins a game, it will get 3 points, and if it draws a game, it will get 1 point. So, which team will win? Field.

6. A car carried a pile of stones. On the first day, the 1/3 of that pile of stones was more than 2 tons. The remaining 1/2 is less than 1 ton the next day. At this time, there are still 38 tons of stones left. Is this pile of stones original? Tons.

1 & gt； 3x+5y=k+ 1

2 & gt2x+3y=k

3 & gtx+y=2

1 & gt； -(2 & gt； +3 & gt； )

Y = - 1。

1 & gt； -2 & gt；

The solution is x=3.

The solution is k=3.

Five, let it win x games.

3x + (8-x) = 23

Solve x=8.5, play 8 games and win 8.5 games, bullshit problem.

Even if 8 Yang wins 7 games, the draw can be regarded as 2 1 point instead of 23 points. . NND