There are two questions in the fifth grade? Two 5th grade math problems

This is the drawer principle.

There are a total of five possibilities for scoring after these two questions: 1Both questions are correct: 4 points.

2.None of the two questions: 2 points.

3.Wrong in both questions: 0 points.

4.None of the questions are done: 3 points.

5.One question is not done and one question is wrong: 1 point.

From "at least 6 students have the same score on each question", it can be seen that the score of each question should be used as a drawer, and the student should be an object. There are 3 3 = 9 scoring situations, i.e. there are 9 drawers. This question translates to:

It is known that at least one of the 9 drawers has at least 6 items, resulting in at least 9x(6 1)+1=46 people.

2.Look at the question clearly: each question is scored the same, i.e. both questions are scored the same. There are 5 types of scoresThere are 9 scoring combinations

In 8 out of 9 cases, 5 people are the same, and in any 1 case, 6 people are the same. 5*8+6=46

3.There are 3 possibilities for each question, so there are 9 possibilities in total, so if there are only 9 people, then there may be no one else, if there are 5 * 9 people, then there may be only 5 people who are the same, and if there is one more person, he will definitely be the same as the previous 5 people, so 46 people are enough.

4.It can be seen from the fact that "at least 6 students have the same score on each question", and the score of each question should be regarded as a drawer and the student as an object. If (a, b) is used to indicate the score of each question, where a and b represent the first.

1. The score of the second question, then there are 9 situations of (2,2), (2,1), (2,o), (1,2), (1,1), (1,o), (0,2), (0,1), (0,0), that is, there are 9 drawers. This question becomes: Knowing that at least one of the 9 drawers has at least 6 items, find at least how many items there are.

Using the drawer principle in reverse, we get at least: 9 (6-1) + 1 = 46 (people).

1) Did you forget to give a high in the first question? Please give Gao out, I'll do it for you.

2) Solution: If the weight of the pear is xkg, then the weight of the apple is (2x-5)kg2x+(2x-5)=760

4x=760

x=1902*190-5=375kg

The weight of pears and peaches is 190kg, the weight of apples is 375kg, and the method of the first place is not a one-dimensional equation, so you probably haven't learned it yet.

Dividing by 8 equals 60 (speed).

480 divided by (60-2) = ....

A: ...2.Solution: Set a child fare of x yuan.

10-2x-x=

x=...A: ...

The result is calculated by yourself).