Tìm x, biết:
Tìm x, biết:
k) 2/3 ÷ 14/15 + 4/7 . ( x - 1 )² = √36/49
l) (15/4 - 5x ) . ( 9x² - 4 ) = 0
m) √x - 2 + 1/3 = 1
o) 7^2x + 7^2x+3
k) 2/3 ÷ 14/15 + 4/7 . ( x - 1 )² = √36/49
l) (15/4 - 5x ) . ( 9x² - 4 ) = 0
m) √x - 2 + 1/3 = 1
o) 7^2x + 7^2x+3