Question

求解答~~~~~~~~~~~~~~~~~~~~~~~

Answer 1

1. (x²-2xy+y²)-9

   =(x-y)²-9

   =(x-y+3)(x-y-3)

2. (x²+2x+1)-y²

   =(x+1)²-y²

   =(x+1+y)(x+1-y)

3. (4a²-4a+1)-b²

   =(2a-1)²-b²

   =(2a-1+b)(2a-1-b)

4. (9x²-6xy+y²)-1

   =(3x-y)²-1

   =(3x-y+1)(3x-y-1)

5. x²-(4-12y+9y²)

   =x²-(2-3y)²

   =(x+2-3y)(x+2-3y)

6. (a²-b²)+(a-b)

   =(a+b)(a-b)+(a-b)

   =(a-b)(a+b+1)