Ask for question 37. There are steps. Question 7: What are the steps?

a-7x1 , a-7x0 , a+7x1

The sum of the first column: 10 + (10 + 7) + (10 + 7x2) + (10 + 7x3) = 10x4 + 7x6 = 82

The sum of the four columns: 82x4 + 4x1 + 4x2 + 4x3 = 82x4 + 4x6 = 352

Let the minimum number be a, and the maximum number = a+7x3+3=a+24

Let the sum be b, (ax4+42)x4+24=b, so a=[(b-24) 4-42] 4=(b-24) 16-42 4=b 16-12

A=113 when b=2000, a= when b=2004

Answer: The sum cannot be equal to 2004, and when the sum is equal to 2000, the minimum number is 113 and the maximum number is 137

1. A-7, A, A+7 can find the law. Understand that from the first number + 7 days is exactly the next number. 7 days is a week.

2. As 1 said, they are all 7 differences, let's look at them line by line:

The sum of the first line can be easily found as 46Then because the lower row has more 7s than the previous row, there are 4 more 7sSo the following is 46+28=74, and so on is 74+28=102, 102+28=130, that is, let the sum of the first row be sn, so it is sn, sn+28, sn+56, sn+84

That is, the sum of 46, 74, 102, and 130 is 352

You can also look at it one by one, and so on.

3.Above we find that these 16 numbers are sn, sn+28, sn+56, sn+84. So sn+sn+28+sn+56+sn+84=4sn+168=, we see that the number in the first row above is four numbers with a difference of 1.

i.e. a, a+1, a+2, a+3 so 4a+6=458 a=113 so the maximum number is 116 and the minimum number is 113And so on when the sum is 2004. 4a+6=459, a=so this is impossible.

<> such as a frank touch of socks let the excitement be noisy.

The answer is c

Note that the integral region is a circle with (1 2, 1 2) as the center and 1 sqrt(2) as the radius, and then it can be found by changing the polar coordinates and changing the orange town.

<> refer to the following Hunger Resistance.

Such as the unbridled rolling picture chain hail celery shed finished.

If you don't <> understand, please feel free to ask.

Hope, thank you. Questions about freshman math can be asked to me, and I'm also a freshman.

It's been years since I graduated from college, and I really forgot about it. If you're taking an exam right now, you can also give some marks by writing down the formulas you've learned in the book.

<> remember my fire-resistant answer, I wish you Chang Nianxu to learn and make progress.