a)x^2-3x+xy-3y b)ax+2y+2x+ay c)x^2+xy-7x-7y d)x^2-xy-2x+2y e)5x-5y-ax+ay

0 bình luận về “a)x^2-3x+xy-3y b)ax+2y+2x+ay c)x^2+xy-7x-7y d)x^2-xy-2x+2y e)5x-5y-ax+ay”

1. Đáp án:

   a, x² – 3x + xy – 3y

   = x(x – 3) + y(x – 3)

   = (x – 3)(x + y)

   b, ax + 2y + 2x + ay

   = ax + 2x + ay + 2y

   = x(a + 2) + y(a + 2)

   = (a + 2)(x + y)

   c, x² +xy – 7x – 7y

   = x(x + y) – 7(x + y)

   = (x + y)(x – 7)

   d, x² – xy – 2x + 2y

   = x(x – y) – 2(x – y)

   = (x – y)(x – 2)

   e, 5x – 5y – ax + ay

   = 5(x – y) – a(x – y)

   = (x – y )(5 – a)

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2. Đáp án:

   a, `x^2 – 3x + xy – 3y`

   `= (x^2 + xy) – (3x + 3y)`

   `= x(x + y) – 3(x + y)`

   `= (x – 3)(x + y)`

   b, `ax + 2y + 2x + ay`

   `= (ax + ay) + (2y + 2x)`

   `= a(x + y) + 2(y + x)`

   `= (a + 2)(x + y)`

   c, `x^2 + xy – 7x – 7y`

   `= (x^2 + xy) – (7x + 7y)`

   `= x(x + y) – 7(x + y)`

   `= (x – 7)(x + y)`

   d, `x^2 – xy – 2x + 2y`

   `= (x^2 – xy) – (2x – 2y)`

   `= x(x – y) – 2(x – y)`

   `= (x – 2)(x – y)`

   e, `5x – 5y – ax + ay`

   `= (5x – 5y) – (ax – ay)`

   `= 5(x – y) – a(x – y)`

   `= (5 – a)(x – y)` 

   Giải thích các bước giải:

    

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