Tìm x :
a, x mũ 3 = 3 mũ 3
b, 3 mũ x = 3 mũ 2
c, x mũ 2 = 3 mũ 2
d, (x = 1) mũ 2 = 9
e, ( 2x - 3 ) =27
f, (x+1) mũ 2 + (y -2) mũ 2 = 0
g, (x - 2 ) mũ 21 = ( x - 2 ) mũ 19
h, ( x + 1 ) (x mũ 2 + 1 ) = 0
i, / x / + / x + 1 / + / x + 2 / + / x + 3 / = 3x
k, / x / + / x + 1 / + / x + 2 / + / x + 3 / = 5x