The factor is 7, the product is 42, and the other factor is

The factor is 7, the product is 42, and the other factor is

It's seven

6 + 7 + 8 = 7X3 = 21. In the rewriting multiplication formula, which addend is the first factor, and what is the second factor?

6 + 7 + 8 = 7X3 = 21, the first factor is an addend in the middle, and the second factor must be 3

Simple calculation of 7 / 11-3 / 14 × 7 / 11
It's urgent

7 / 11-3 / 14 × 7 / 11
=(7/11)×(1-3/14)
=(7/11)×11/14
=1/2;
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Factorization of (a ^ 2 + 2Ab + B ^ 2)
I really don't understand how (a ^ 2 + 2Ab + B ^ 2) can be decomposed into (a + b) ^ 2
Thank you very much!

a²+2ab+b²
=a^2+ab+ab+b²
=a(a+b)+b(a+b)
=(a+b)(a+b)
=(a+b)²
You can work it out the other way round
（a+b）^2=(a+b)*(a+b)
=a*a+a*b+a*b+b*B
=a^2+2ab+b^2

6 / 5 = 18: () = (): 20 = () / 25 = () divided by 40

6 / 5 = 18: (15) = (24): 20 = (30) / 25 = (48) divided by 40

Write out the parameter equation of the straight line which passes through the point m (1,5) and the inclination angle is 60 degree. (1) use this parameter equation to find the distance from the intersection of the straight line and the straight line x-y-2 √ 3 = 0 to M

The parametric equation is {x = 1 + 1 / 2 * t, y = 5 + √ 3 / 2 * t, where t is the parameter (| t | denotes the distance from point P (x, y) to point m, t is the positive time, P is on the top right of M, and t is the negative time, P is on the bottom left of M)

How to solve the equation when (5x-25) / (4x + 25) = 5 / 7?

Multiply both sides by 7 (4x + 25) to get: 7 (5x-25) = 5 (4x + 25)
The result is: 35x-175 = 20x + 125
35x-20x = 125 + 175
Combining the similar items: 15x = 300
The coefficient is changed to 1, and both sides are divided by 15 at the same time to get x = 20

If M = {0, 1, 2}, n = {(x, y) | x-2y + 1 ≥ 0 and x-2y-1 ≤ 0, x, y ∈ m}, then the number of elements in n is______ ．

Draw the feasible region represented by the set n = {(x, y) | x-2y + 1 ≥ 0 and x-2y-1 ≤ 0, x, y ∈ m}, as shown in the figure. From the meaning of the question, we can see that there are only four points (0,0), (1,0), (1,1) and (2,1) in n that satisfy the condition, so the answer is: 4

1/11-11/31+2/11-12/31+3/11-13/31+.+10/1-20/31=?

(1+10)*10/2 / 11 - ((11+20)*10/2) / 31 = 55 / 11 - 155 / 31 = 0

Given circle C: x ^ 2 + y ^ 2-4x-6y-3 = 0 and line L: kx-y + 1-3k = 0 (K ∈ R) [find the minimum chord length of line L cut by circle C]
Given circle C: x ^ 2 + y ^ 2-4x-6y-3 = 0 and line L: kx-y + 1-3k = 0 (K ∈ R)
[find the minimum chord length of line L cut by circle C]

(X-2) ^ 2 + (Y-3) ^ 2 = 16 = 4 ^ 2, center of circle (2,3), straight line kx-y + 1-3k = 0 (K ∈ R)
The constant crossing point (3,1) is the vertical line L1 from the center of the circle to the straight line, so kl1 = - 2, that is, k = 1 / 2,
Therefore, the minimum chord length of line L cut by circle C is the root sign 11 with 2x (R ^ 2-5) = twice under the root sign