A-3/6+4/6=2a-5/5
1/6+1=2a-a
a=1 1/6
<span>(с+4589)-5 869=3 126</span>
<span>с+4589=3126+5869</span>
<span>с+4589=8995</span>
<span>с=8995-4589</span>
<span>с=4406</span>
10×5=50 минут катание всех
2×4=8 минут
10.15+58 =11.13
Sin(360+50)+cos(360-60)-tg(180+30)=sin50+1/2-√3/3
1) 1.8x+x+5x=180
7.8x=180
x=23 6/78=23 1/13
2) 1 8/10*23 1/13=18/10*1800/78=1620/39=41 21/39=41 7/13
3) 5*1800/78=115 30/78=115 5/13