<span>11,3у - (9,7у - 0,8у) + 7,4 = 17</span>
<span>11,3у</span>-8,9у=17-7,4
2,4у=9,6
y=9,6/2,4
y=4
:D
<span>2√12-√75=2*</span>√3 * √4-√3 * √25=4√3-5√3=-√3
2sin3x+cos3x=0
sin3x+sin(π/2-3x)=0
2sinπ/4cos(3x-π/4)=0
cos(3x-π/4)=0
3x-π/4=π/2+πn
3x=π/4+π/2+πn
3x=3π/4+πn
x=π/4+πn/3