Решение смотри на фотографии
Объяснение:
a) x + y - z = 5 + 8 = 13
б) x - 5z + y = 5 - 5*(-8)= 5 + 40 = 45
в) 3( x + y ) + 2z = 3*5 + 2*(-8) = 15-16=-1
г) z/(x + y + z) = -8/(5 - 8) = -8/(-3) = 8/3
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<span> (sin (3x/2)+ cos(3x\2))^2=1\2</span>
<span>sin^2(3x/2)+2sin3x/2cos3x/2+cos^2(3x/2)=1/2</span>
<span>1+sin3x=1/2</span>
<span>sin3x=-1/2</span>
<span>3x=(-1)^(n+1)*pi/6+pi n</span>
<span>x=(-1)^(n+1)*pi/18+1/3pi n</span>