Tìm x

Tìm x
a) (11x - 2^3) .7=2.7^3
b) x^2 = 16x
c) 25<5^x<625
d) ( 3x - 1 ) . 2 - 1 = 2^3 . 5 - 2001^0
đ) ( x^2 -25 ) . ( x + 5 ) = 0
e) ( 7x - 11 )^3 - 2^5 . 5^2 = 200