1) 3x ²+ 6xy 2) 10 x ²y + 15xy² 3) x ³ – x + 2x ²y-2y 4) x ² – y ² + 2x + 2y

2 bình luận về “1) 3x ²+ 6xy 2) 10 x ²y + 15xy² 3) x ³ – x + 2x ²y-2y 4) x ² – y ² + 2x + 2y”

1. 1, 3x^2 + 6xy

   = 3x(x + 2y)

   2, 10x^2 y + 15xy^2

   = 5xy(2x + 3y)

   3, x^3 – x + 2x^2 y – 2y

   = x(x^2 – 1) + 2y(x^2 – 1)

   = (x + 2y)(x^2 – 1)

   = (x + 2y)(x – 1)(x + 1)

   4, x^2 – y^2 + 2x + 2y

   = (x – y)(x + y) + 2(x + y)

   = (x + y)(x – y + 2)

   Trả lời
2. 1)3x^2+6xy=3x(x+2y)

   2)10x^2y+15xy^2=5xy(2x+3y)

   3)x^3-x+2x^2y-2y

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

   =x(x^2-1)+2y(x^2-1)

   =(x^2-1)(x+2y)

   =(x-1)(x+1)(x+2y)

   4)x^2-y^2+2x+2y

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

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

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

   Trả lời