Rút gọn : (3$\alpha$ + 1${}^2$ – 2(3$\alpha$ + 1).(1 – 3$\alpha$ ) + (1-3$\alpha$${}^2$)

2 bình luận về “Rút gọn : (3$\alpha$ + 1${}^2$ – 2(3$\alpha$ + 1).(1 – 3$\alpha$ ) + (1-3$\alpha$${}^2$)”

1. (3a+1)^2-2(3a+1)(1-3a)+(1-3a)^2

   =[(3a+1)-(1-3a)]^2

   =[3a+1-1+3a]^2

   =(6a)^2

   =36a^2

   Trả lời
2. (3a + 1)^2 – 2(3a + 1)(1 – 3a) + (1 – 3a)^2

   = (3a + 1 – 1 + 3a)^2

   = (6a)^2

   = 36a^2

    

   Trả lời