Question

Phân tích đa thức thành nhân tử :

a) (a - b) . (b - a) . y + a - b

b) (x - y + z) .(a + y - x -z) .b - x + y - z

c) (2a + 3).x - (2a + 3) .y + 2a +3

d) (a - b). x + (b - a). y- a+b

Answer 1

a. (a-b)(b-a)y+a-b=(a-b)[(b-a)y+1]

b. (x-y+z)(a+y-x-z)b-x+y-z=(x-y+z)(a-y-x-z)b-(x-y+z)=(x-y+z)[(a-y-x-z)b-1]

c. (2a+3)x-(2a+3)y+2a+3=(2a+3)(x-y+1)

d. (a-b)x+(b-a)y-a+b=(a-b)x-(a-b)y-(a-b)=(a-b)(x-y-1)