а)5/9 : x = 3.3/4
х=5/9:3.3/4
х=200/297
b) s : 6/7 = 3.2/5
х=3.2/5*6/7
х=96/175
c) 5.1/2 + 0,6y = 16
0.6у=16-5.1/2
0.6у=13.45
х=22 5/12
