АС AD BD AO OC DO OB MN FK FE EN
<span>х-0,64х=2,808
х(1-0,64)=2,808
0,36х=2,808
х=7,8</span>
1сут=24часа ;24×5:12=10(часов)
-3/5-1/5= - 4/5
-1/3-2/3= - 3/3= - 1
-1/4-5/7 = - 7-20/28= - 27/28
-5/6-1/3=(-5-2)/6=-7/6= - 1 1/6
-4 3/8-3 1/4= - 7 5/8
-6 1/2-3 5/7= - 9 17/14= -10 3/14
-3/7-4/7= - 7/7= -1
-1/8-3/4= - 7/8