thu gọn: 5y.(2y-1)-(3y+2).(3-3y) (6x+1)^2-2.(6x+1).(6x-1)+(6x-1)^2 (2x+3)^2-2.(2x+3).(x-2)+(x-2)^2

1 bình luận về “thu gọn: 5y.(2y-1)-(3y+2).(3-3y) (6x+1)^2-2.(6x+1).(6x-1)+(6x-1)^2 (2x+3)^2-2.(2x+3).(x-2)+(x-2)^2”

1. 1.5y(2y-1)-(3y+2)(3-3y)

   =10y^2-5y-(9y-9y^2+6-6y)

   =10y^2-5y-(-9y^2+3y+6)

   =10y^2-5y+9y^2-3y-6

   =19y^2-8y-6

   b)(6x+1)^2-2(6x+1)(6x-1)+(6x-1)^2

   =[(6x+1)-(6x-1)]^2

   =(6x+1-6x+1)^2

   =2^2

   =4

   c)(2x+3)^2-2(2x+3)(x-2)+(x-2)^2

   =[(2x+3)-(x-2)]^2

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

   =(x+5)^2

   =x^2+10x+25

   Trả lời