2. Among the eight numbers 3, 4, 5, 6, 7, 8 and 9, the sum of any four numbers is multiplied by the sum of the other four numbers, and () different products are obtained?

2. Among the eight numbers 3, 4, 5, 6, 7, 8 and 9, the sum of any four numbers is multiplied by the sum of the other four numbers, and () different products are obtained?

The sum of any four numbers is 8 + 7 + 6 + 5 = 26. Select the first four and the last four to determine
Just 26

A copy of the number is multiplied by 4 and 6, and then the sum of the resultant product is 6900. What is this number?

This number = 6900 ÷ (4 + 6) = 690

A number is added, subtracted, multiplied and divided by itself. The sum of the result is 8.6. What is this number

Let this number be X
Then: x + X + x-x + x ^ 2 + X / x = 8.6
2x+x^2+1=8.6
(x+1)^2=8.6
x1=(√215-5)/5
x2=（-√215-5）/5

What is the quotient of 5 / 6 plus 7 / 3 divided by 7 / 2?

Reciprocal of 5 / 6 = 6 / 5,
Formula: 6 / 5 + 3 / 7 ÷ 2 / 7
=6/5+3/7 × 7/2
=6/5+3/2
=12/10+15/10
=27/10
=2.7
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The reciprocal of a number is 6 7, 6 of this number What is 7?

1÷7
six × six
seven
=6
seven × six
seven
=36
49．
A: six of this number
7 is 36
49．

Why is differential mean value theorem called mean value theorem? What does the word "median" mean? What aspects are embodied in the theorem? I have been confused about the origin of the name of the mean value theorem since I learned it. I may not have learned it thoroughly and failed to grasp the essence of the theorem

Because the mean value theorem says that there is at least one point in (a, b) ξ Make
This value is in one of the intervals (a, b) ξ, So it's called the median