Х:5=7:1/2
х*1/2=5*7
х*1/2=35
х=35:1/2
х=35*2/1
х=70
12:29=1/58:х
12*х=29*1/58
12*х=29/58
12*х=1/2
х=1/2 :12
х=1/2 *1/12
х=1*1/2*12
х=1/24
144:125=1(целая)1/2:х
144:125=3/2:х
144*х=125*3/2
144*х=375/2
х=375/2 :144
х=375/2*1/144
х=375*1/2*144
х=375/288
х=125/96
х= 1 29/96 (1 целая 29/96)