Ab × 3 = 1ab find out what a and B are. Thank you,

Ab × 3 = 1ab find out what a and B are. Thank you,

AB×3=1AB,3AB-AB=0,2AB=0,AB=0,{ A=0,B=0.

If a + B = 7, ab = 12, then a * a-Ab + b * B=（

(a+b)^2-3ab=49-3x12=13

If A-B = 2, then 12 (A2 + B2) - ab=______ ．

Because A-B = 2, 12 (A2 + B2) - AB = 12 (A2 + b2-2ab) = 12 (a-b) 2 = 12 × 22 = 2

If a / b = 5, then the square of a + the square of B / AB asks the great God for help

Step: A / b = 5, then the square of a / b = 25, the square of a = 25 (the square of B), the square of a + the square of B = 26 (the square of B), the square of a + the square of B / AB = 26 (the square of B) / AB = 26b / a = 26 / 5

Define a ⁃ B = ab-a-b + 1, find the value of 5 ⁃ 5, thank you,

5※5=5*5-5-5+1=6

It is known that a2-n × AB + 64b2 is a complete square, then n is equal to ()
A. 8B. ±8C. ±16D. ±32

∵ a2-n × AB + 64b2 is a complete square, the two numbers are a and 8b, nab = ± 16ab, the solution is n = ± 16

Is the quadratic power of a minus the quadratic power of B plus double AB the complete square formula?

It's not the quadratic power of a plus the quadratic power of B plus minus two
Times ab

Who can help me decompose the factor? Use the complete square formula!
4 times the square of the sum of X and Y minus 28 times the square of x minus the square of y plus 49 times the square of x minus Y!

4 (x + y) ^ 2-28 (x ^ 2-y ^ 2) + 49 (X-Y) ^ 2 = 4 (x + y) ^ 2-28 (x + y) (X-Y) + 49 (X-Y) ^ 2 let x + y = a, X-Y = B, the original formula = 4A ^ 2-28ab + 49b ^ 2 = (2a-7b) ^ 2 be substituted into a and B, and then 4 (x + y) ^ 2-28 (x ^ 2-y ^ 2) + 49 (X-Y) ^ 2 = (2x + 2y-7x + 7Y) ^ 2 = (9y-5x) ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2 ^ 2

Factorization by complete square formula
1.998²
2.700²-1400x698+698²

1.=（100-2）^2=100^2-400-4
2.=(700-698)^2

Using simple algorithm to calculate 2009 & sup3; - 2008 × 2009 × 2010

2009³-2008×2009×2010
=2009³-(2009-1)×2009×(2009+1)
=2009³-2009X(2009²-1)
=2009³-2009³+2009
=2009