Ask me questions in the future. ...

I'll teach you how to do problems and how to do a series of problems.

Let you extrapolate, get twice the result with half the effort.

But the premise is:

1, do you really want to learn well?

2. primary school mathematics must pass.

3. Spend more time on math.

To show that I am awesome, I'll do the math for you.

Should fill-in-the-blank questions and multiple-choice questions in junior high school mathematics be Tao questions? (Forgot) 4 points for each question (5 points for high school)

From the perspective of poor grades, I personally feel that big questions are empty, multiple-choice questions are blind, and fill-in-the-blank questions are occasionally done.

So you get 4 points:

1, if you choose all wrong, you can do one right in the blank. Considering that the first two items in the blank are quite simple (the probability that you dare to write is 0.5, and the probability that you are still right is 0.25), the probability is.

0.75^ 10*(c(2, 1)*0.5*0.25*0.5+c(2, 1)*0.5*0.5*0.75*0.25)=0.75^ 10*0.2 1875=0.0 123 186

Explain that you didn't score in the fill-in-the-blank question.

1, no pen: 0.5*0.5=0.25

2. I moved a question and made a mistake: 2*0.5*0.75*0.5=0.375.

3. Both questions are wrong: 0.5 * 0.75 * 0.5 * 0.75 = 0.140625.

Total probability =0.765625

The probability of getting 8 points in the blank space (both questions are correct) is: 0.5 * 0.5 * * 0.25 * 0.25 = 0.015625.

Get 4 points:

1, did two questions and got one right: 2*0.5*0.5*0.75*0.25=0.09375.

2. I did a question and got it right: 2*0.5*0.25*0.5=0. 125.

Total probability =0.2 1875

2. Choose the right question and fill in the blanks completely wrong:

0.75^9*0.25* 10*0.765625=0. 1437 17

Therefore:

The probability that such students get 4 points is: 0.0123186+0.143717 = 0.1560356.

Note: Due to the harsh premise, multiple-choice questions are confused without considering the situation of doing the questions, so the calculated probability will be smaller than the actual probability.

LZ wants to ask me what to express?

In fact, I just want to say that getting 4 points is not a glorious thing. Even blind people, one in seven people can do it.

Don't confuse math with English.

Too few math multiple-choice questions

English choices can be all right, either an English expert or a great god.

English can be completely wrong, and one in a million is a super awesome person.

Both cases are limited to the case of doing it all.

I always talk nonsense. LZ really wants to improve his grades, but he has to figure out what to do and make up his mind.

I wish LZ a happy study!