<span>0,6*(28x+44(2,5-x))=16x+32(2,5-x)</span>
<span>0.6*(-16x+110)-16x-32*(2.5-x)=0</span>
<span>-25.6x+66-32*(2.5-x)=0</span>
<span>-25.6x+66-80+32x=0</span>
<span>-25.6x-14+32x=0</span>
<span>6.4x-14=0</span>
x=14/6.4
x=35/16 (~2.1875)
Sin0=0
cos90=0
sin^2(45)=(√2/2)^2
tg^2(30)=(√3/3)^2
0+0+2/4+3/9=1/2+1/3=5/6