Ответ:
6/24=1/4=0,25
..............................
1- х
<span>2- х + 5 </span>
<span>3 - х + 10 </span>
<span>х+х+5+х+10=105 </span>
<span>3х+90 </span>
<span>х=30 </span>
<span>ответ: 1 - 30, 2 35, 3 40</span>
4sin(180-30)*cos60=4sin30*cos60=4*1/2*1/2=1