5)1/2(1-y) +5/4(y²+y+1)+3y/(1-y)(y²+y+1)=0y≠12y²+2y+2+5-5y+12y=02y²+9y+7=0D=81-56=25y1=(-9-5)/4=-3,5y2=(-9+5)/4=-16)(18z+7)/(z-1)(z²+z+1) -30/(z-1)(z+1)+13/(z²+z+1)=0z≠1 z≠-118z²+18z+7z+7-30z²-30z-30+13z²-13=0z²-5z-36=0z1+z2=5 U z1*z2=-36⇒z1=-4 U z2=98)6/(x-3)(x+3) +(13-x)/(3+x)-3/(x+3)-2/(x-3)=06/(x-3)(x+3) +(10-x)/(3+x)-2/(x-3)=0x≠3 x≠-36+10x-30-x²+3x-2x-6=0x²-11x+30=0x1+x2=11 x1*x2=30⇒x1=5 U x2=67)(6-x)/(3(x-2)(x+2) -1/(x-2) -1/(x-2)=1(6-x)/(3(x-2)(x+2) -2/(x-2)=1x≠2 x≠-26-x-6x-12-3x²+12=03x²+7x-6=0D=49+72=121x1=(-7-11)/6=-2-не удов услx2=(-7+11)/6=2/3