1. а) ((2x-2y)/y)* 3y²/(x²-y²)=(2(x-y)*3y²/(y*(x-y)(x+y))=6/(x+y).
б) 6с²/(3+2с)-3с=(6с²-9с-6с²)/(3+2с)=-9с/(2с+3).
2. а) √8*√6/√24=√48/√24=√2.
б) 6/(2√3²=6/(4*3)=1/2.
в) √3^6*2^4*2^2=3³*4²*5=180.
3. a) (1/3)x²=3
x²-9
x1=3 x2=-3.
б) x²-7x-8=0 D=81 x1=8 x2=-1.