A simple algorithm to find the square of (2a + B-C) minus the square of (2a-b + C)

A simple algorithm to find the square of (2a + B-C) minus the square of (2a-b + C)

(2a+b-c)²-(2a-b+c)²
=(2a+b-c-2a+b-c)(2a+b-c+2a-b+c)
=(2b-2c)(4a)
=8ab-8ac

The square of (2a + b) minus 2 (2a-b) (a + b)
Please use square difference or complete square to solve the problem

(2A+B)^2-2(2A-B)(A+B)=4A^2+4AB+B^2-2(A-B)(A+B)-2A(A+B)
=4A^2+4AB+B^2-2A^2+2B^2-2A^2-2AB
=2AB+3B^2

Known: a + B = one and one seventh, B + C = one and three seventh, a + C = one and four seventh, then what are ABC equal to?

A+B=8/7
B+C=10/7
A+C=11/7
A = 1
B=1/7
C = 10 / 7, that is one and three seventh

a. B is a natural number, a divided by B = 12, then the least common multiple of a and B is (), and the greatest common divisor is ()

a. B is a natural number, a divided by B = 12, then the least common multiple of a and B is (a), and the greatest common divisor is (b)

If the slope value of a straight line is Tana, then its inclination angle is a

Wrong. The relationship between slope and tilt angle is k = Tano, and Tana does not indicate the relationship, so it is wrong

This, your, is, pen

Is this your pen?

Given that the intersection of parabola y = ax & # 178 and the image of linear function y = X-1 is below the x-axis, what is the value range of a?

When the parabolic opening is downward,
The intersection of the parabola y = ax & # 178 and the image of the first-order function y = X-1 lies below the x-axis,
a

Given A-B = 2, what is the value of a & # 178; - B & # 178; - 4B?

a²-b²-4b
=（a＋b）（a-b）-4b
=2（a＋b）-4b
=2a＋2b-4b
=2a-2b
=2（a-b）
=2×2
=4

Change the following parameter equations into ordinary equations and explain their respective expression curves!
（1) x=t+1/t
Y = T-1 / T (t is a parameter)
（2） x=5cos@
Y = 3sin @ (@ is a parameter)
(the @ sign is my own! I can't type the original sign!)
Change the following parametric equations into ordinary equations and explain what curves they represent

1. X = t + 1 / T ------ (1) y = T-1 / T ------ (2) (1) + (2), t = (x + y) / 2 (1) - (2), 1 / T = (X-Y) / 2 (x + y) / 2 * (X-Y) / 2 = t * 1 / T = 1 x ^ 2 / 4-y ^ 2 / 4 = 1, hyperbola 2 x=5cos@y=3sin@ cos@=x/5, sin@=y/3(x/5)^2+(y/3)^2=1x^2/5^2 + y^2/3^2 =1, ...

Seven on 13 to factoring problem fast, I am anxious!
1. X square-4x + 4
2.1/9a square c-4c
3.2X square-32
4.6 (x + y) square-2 (X-Y) (x + y)
5. - 12xy + 3x square + 6xy square
6.4xy (X-Y) - (Y-X) tripartite
7. M square - 18m square + 81
8. (4x square + y Square) - 16x square y square
9. A square - b square + a-b
10. (X-2) square + (X-8)
11. (x-2y) square + 11 (x-2y) + 24
12. X square + 8xy-33y square
13. X Cubic y square - 5x square y square + 6xy

1：(X-2)²2：C﹙1／3A－2C﹚﹙1／3A﹢2C﹚3：2﹙X²﹢4﹚﹙X＋2﹚﹙X－2﹚4:4﹙X＋Y﹚﹙X＋2Y﹚5:3X[2Y﹙Y－2﹚＋X]6:﹙X－Y﹚﹙X＋Y﹚²7:[﹙M＋3﹚﹙M－3﹚]²8:[﹙2X－Y﹚﹙2X＋Y﹚]²9：﹙...