найдите x в пропорциях 15:2,5=0,8x:2/3

0.8х=15/2/3/2.5=40.8х=4х=5

0,8х*2,5=15*2/32х=10х=10/2х=53х*36=45*11/5108х=99х=99:108х=11/123,3х*5=3*5 1/216,5х=16,5х=1(0,6х-2,5)*12,3=0,41*157,38х-30,75=6,157,38х=36,9х=5