...=-12258142
:::::::::::::::::::::::::::
4 4/5:0,8=х: 1 1/6
0,8х= 4 4/5*1 1/6
0,8х=24/5*7/6=28/5=56/10=5,6
0,8х=5,6
х=5,6/0,8=7
х: 9 3/5= 2 2/3: 1 1/15
1 1/15*х= 9 3/5* 2 2/3
1, 1/5*х= 48/5*8/3=16/5*8/1= 128/5
х= 128/5 : 16/15= 128*15/ 5*16= 24
9/25*2 1/7*1 5/9= 27/35 * 1 5/9= 1 1/5
================================
<span>2(4y - 5) = y + 2
8у-10= у+2
8у-у= 2+10
7у=12
у = 1.7</span>
1) 0,65*3,4=2,21
2)45,25:25=1,81
3)2,21+1,81=4,02