I can't do a few math problems. Please see how to do it (in my summer homework).

1.(40+42+45+1) ÷ 3 = 46 First class 46-40=6 Second class 46-42=4 Third class 46-45= 1.

2. If the average score is X, then the English score is x+4, and the formula is: (90+92+X+4) ÷ 3 = X.

3. 1993 is a normal year, 365 days, 7 days a week, 365 ÷ 7 = 52... 1, Tuesday plus 1 day, that is, Wednesday.

4. There are 2 people, 3 people and 4 people respectively. Because the product of the three groups of people is just equal to the date of this day, the product can't be greater than 29, and no one goes alone.

Summer vacation is in July and August, and there are 3 1 day in these two months. Go on July 5, and it will be September 2 in 60 days.

6. Odd numbers are numbers that are not divisible by 2, such as 1, 3, 5, 7, 9 ... Even numbers are numbers that are divisible by 2, such as 2, 4, 6, 8, 10 ... According to the meaning of the question, Sunday should be the 2nd, 9th, 65438.

7. 180=2x3x5x6

8. Let x be the formula: 10x-x=63, and get x=7.

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Kneel for the answer to "Mathematics Teaching and Learning in Grade Nine in Quan Yi" by Zhejiang Education Press! ! ! ! Extra reward! ! ! !

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