а) 1/9×х = 1/3
х = 1/3÷1/9 = 1/3×9/1
х = 3
б) 4×х = 1/16
х = 1/16÷4 = 1/16×1/4
х = 1/64
в) х×1/3 = 12
х = 12÷1/3 = 12/1×3/1
х = 36
