1)3,5:х=2,4:4,8 2)х:2 1/3=9,2:2,3
3,5*4,8=2,4х 2,3х=92/10:7/3
16,8=2,4х 2,3х=138/35
х=7 x=138/35:23/10
x=12/7=1 5/12
3)7,2:2,4=х:4 1/3
72/10:13/3=2,4х
312/10=2,4х
х=31,2:2,4
х=13
4)4 2/7:2 1/7=3,2:х
30/7x=15/7*32/10
30/7x=48/7
x=48/7:30/7
x=48/7*7/30
x=1,6