Question

[Huỳnh Ái My]

Rút gọn biểu thức

a) ( x^2-1)(x+2)-(x-2)(x^2+2x+4)

b) 3(2^2+1)(2^4+1)(2^8+1)(2^16+1)

Answer 1

[Bùi Vương TP (Hacker Ninh Bình)]

Đặt A=3(22 +1)(24+1)(28+1)(216+1)

=(4-1)(2^2+1)(2^4+1)(28+1)(2^16+1)

=[(2^2-1)(2^2+1)](2^4+1)(2^8+1)(2^16+1)

=(2^4-1)(2^4+1)(2^8+1)(2^16+1)

=(2^8-1)(2^8+1)(2^16+1)

=(2^16-1)

Theo mình ý a bn làm đc