(1,5Đ) TÌM X A) 5X = 125; B) 32X = 81 ; C) 52X-3 – 2.52...

Bài 1:(1,5đ)

Tìm x

a) 5

x

= 125;

b) 3

2x

= 81 ;

c) 5

2x-3

– 2.5

2

= 5

2

.3