Y=2sin(-π/2)+cos(-π/2)
y=-1+0=-1
y=2sinπ/6+cosπ/6
y=1+√3/2=(2+√3)/2
200:40=5, 300:5=60\%, 40\%+60\%=100\%
√3*5=<span>√15
</span>√3*5√15=√15√15=<span>√225=15</span>
1+3(5х-7)=9+11х
1+15х-21=9+11х
15х-11х=9-1+21
4х=29
х=29:4
х=7,25
Система уравнений
3(5x+3y)-6=2x+11
<span>4x-15=11-2(4x-y)</span>