3x+3y-x-y PTĐTTNTTTTTTTTTTTTTTTTTTTTTTT

2 bình luận về “3x+3y-x-y PTĐTTNTTTTTTTTTTTTTTTTTTTTTTT”

1. 3x+3y-x-y

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

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

   =(x+y) (3-1)

   =2.(x+y)

   Trả lời
2. cách 1

   3x+3y-x-y

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

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

   =(x+y)(3-1)

   =2(x+y)

    _____________________________

   cách 2

   3x+3y-x-y

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

   =2x + 2y

   =2(x+y)

   Trả lời