10 9X 9X 2 5 How to solve with equations

1.Solution: There are a total of x albums in this batch.

4/5×14x=

x=500A: There are 500 albums in total.

2.Solution: If there are x tons of coal in pile B, then there are (3 4x-24) tons of coal in pile A.

11/8(x-48)=3/4x-24+4811/8x-66=3/4x+24

5/8x=90

x=1443/4x-24=84

Answer: There were originally 144 tons of coal in pile B, and 84 tons of coal in pile A.

3.Solution: Let the number A be x and the number B be (185-x).

1/4x+1/5(185-x)=42

1/20x=7

x=140185-x=45

Answer: The number A is 140 and the number B is 45

4.Solution: Set up male x people and female students (465-x).

2/3(465-x)=4/5x-20

330=22/15x

x=225465-x=240

A: There are 225 boys and 240 girls.

5.Solution: Set the original coal x tons, which has been burned (3 10x+50) tons.

x-（3/10x+50)=3/4x-35030=3/4x-7/10x

30=1/20x

x=600 A: 600 tons of original coal.

x＝13

Considerations for solving equations.

1. If there is a denominator, go to the denominator first.

2. If there are parentheses, remove the brackets.

3. If you need to move the item, you will move the item.

4. Merge similar items.

5. The coefficient is reduced to 1 to obtain the value of the unknown.

6. Write "solution" at the beginning.

The process of solving the equation is as follows:

Solution: x x 13

So the final result of solving the equation is x 13.

10 - Resistance =

Solution: Shift and Item:

110 merge similar items to:

One by one, Chang brings the source.

The coefficient is reduced to 1 to obtain: x=.

Summary. Solve equations.

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