1) (a/ a^2+ab) — (1/a^2) a+b/ab) 2) x+(12/x)=83) (x-1/x+1)=(9/1-x)

1) (1/a+ab) -1/ (a²*(a+b/ab)=(1+a²b) /a-ab/ (a² (a²b+b)=(1+a²b) /a-1/a (a²+1)=(a²b+1) (a²+1) -1/a (a²+1)=(a⁴b+a²+a²b+1-1) /a (a²+1)=a² (a²b+b+1) /a (a²+1)=(a³b+ab+a) / (a²+1) 2) x+12/x=8*x x²+12=8xx²-8x+12=0x₁=2x₂=6 3) (x-1/x+1)=9-x (x²+x-1) /x=9-xx²+x-1=9x-x²2x²-8x-1=0D=(64+2*4)=72x₁₋₂=2±1,5√2