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Math contest question and answer
① When a store buys an item, the price drops by 6.4% and the profit rate rises by 8%. What is the original profit rate?

(2) Employees of a factory go out to travel, each car has 22 people, leaving 1 person. If one car is removed, people will be divided equally, and there is nothing left. How many employees and cars are there?

③S = 1÷ 1/ 1980+ 1/ 1+ 1/ 1982+……+ 1/2000+ 1/20 1 1

What is the integer part of s?

④(2x+ 1)? ﹢? =ax? ﹢? +bχ? ﹢cχ? ﹢dχ? ﹢eχ+f a+b=?

This is the Olympic exam I just took, and some questions are difficult for me to answer.

Answer:

I can't answer the first question.

The second question is two cars with 45 employees (probably wrong)

The third question is 4379 1.

Neither will the fourth question.

But I survived. I made a lot of mistakes.

Life is so hard.