In the algebraic expression 3x, 3 is called the sum of the letter factor X___ The coefficient of 1 / 2Ab is___ .

In the algebraic expression 3x, 3 is called the sum of the letter factor X___ The coefficient of 1 / 2Ab is___ .

Multiple: 1 / 2

Decompose the following factor to the second power of 4 [a + b] - 12 [a + b] + 9

The original formula = [2 (a + b) - 3] ²
=（2a+2b-3）²

Decomposition factor 9x ^ 2-y ^ 2-4y ^ 2-4

Item 3 should not be squared, right
9x2-y2-4y-4
=9x2-(y2+4y+4)
=9x2-(y+2)2
=(9-y-2)(9+y+2)

Factorization: x3-x=______ The decomposition factor is A2 + 4A + 4=______ The factorization factor is 4x2-25=______ Factorization: 9x2-y2-4y-4=______ ．

X3-x = x (x2-1) = x (x + 1) (x-1); A2 + 4A + 4 = (a + 2) 2; 4x2-25 = (2x + 5) (2x-5); 9x2-y2-4y-4 = 9x2 - (y + 2) 2 = (3x + y + 2) (3x-y-2)

Decomposition factor: 9x ^ 2-y ^ 2-4y-4 = what

9x²-y²-4y-4
=9x²-(y²+4y+4)
=9x²-(y+2)²
=(3x+y+2)(3x-y-2)

The classroom is 8m long, 7m wide and 3.5m high, with 56 students sitting in it. The average area occupied by each student is A1 square meters, b1.5 square meters, c0.5 square meters and d1.2 square meters

If the length is 8m and the width is 7m, the classroom area is 56 square meters
There are 56 students in total, so the average area occupied by each student is
A. 1 square meter

A rectangle is 2 / 7m in length and 5 / 7 in width. How many square meters is the area of this rectangle?

2 / 7x5 / 7 = 10 / 49 M2

Given that AB is opposite to each other and CD is reciprocal to each other, the value of 3A + 3b-2cd is
Details!

Because AB is opposite to each other, the sum of AB is zero
CD is reciprocal to each other, so the product of CD is equal to 1
3A + 3B can be changed into 3 (a + b) by multiplicative Association law, which is 3 times zero or zero
-The product of Cd in 2CD is 1, so this part is - 2
Finally, zero minus two is still two

If AB is opposite to each other, CD is reciprocal to each other, and a ≠ 0, what is the value of 3A + 3B + B / A-CD?

a＋b＝0,cd＝1
The original formula = 0 + (- 1) - 1 = - 2

When m is equal to what number, the algebraic formula 9m − 34 − m3 is less than M2 − m − 46 by 3

From the Title Meaning: M2 − m − 46 − 3 = 9m − 34 − m3, remove the denominator to get: 6m-2 (M-4) - 36 = 3 (9m-3) - 4m, transfer to get: 6m-2m + 8-36 = 27m-9-4m, merge to get: - 19m = 19, the coefficient is 1 to get: M = - 1. When m = - 1, the algebraic formula 9m − 34 − m3 is less than M2 − m − 46 by 3