Help me do the math, thank you, help me do the math, thank you

Fortune telling? Or is it nothing.

Why do you ask this, the exam paper is a measure of how much knowledge you have mastered in the process of learning, those places have not been mastered, and you still need to study hard, this is just a means, what you say, you can only get one question wrong.

There are 9 questions in the paper, and to reach 80%, you have to have 9 x 80% = correct, so you can only have 9 - = wrong.

7x+8/9=10x-4/5

8/9+4/5=3x

76/45=3x

x=76/135

300-3x÷2=5x

600-3x=10x

13x=600

x=600/13

x+3）×4=36

x+3=9x=67x-200=4x+300

3x=500

x=500/3

In the last question, change the denominator to the same, add it up, and finally divide it by the common divisor.

The guy up there is wrong, there are sidewalks all around, it should be:

Set the sidewalk width to x

The stadium has a field area of 3500

The length of the stadium is 80-2x, and the width is 60-2x

80-2x）*（60-2x）=3500

x = 5 A: The width of the sidewalk is 5 meters.

Set the sidewalk width to x

The stadium has a field area of 3500

The length of the stadium is 80-x, the width is 60-x

80-x）*（60-x）=3500

x=10

I look at your unit very strangely, but it should be measured by meters:

80-2x）*（60-2x）=3500

> x = 5 or 65 (rounded > 60).

So 5 meters when the sidewalk.

It can be obtained from the two formulas: cost + profit = tax

Bring in a triplicate: tax = 4750

Calculate the tax =

Kids, use a calculator on your phone! Are you too stupid or too lazy? I did two questions for you, and I was too lazy.

Isn't it enough to use a calculator, can you take pictures with your mobile phone, but can't you use a calculator?

With a computer, you have a mobile phone anyway.