39х³у/26х²у²=3х/2у=1,5х/у
3у/у²-2у=3у/у(у-2)= 3/у-2
3а-3b/a²-b²=3(a-b)/ (a-b)(a+b)=3/ (a+b)
a²-25/a²-10a+25=(a-5)(a+5)/(a-5)²=a+5/a-5
3-2a/2a - 1-a²/a²= 3a-2a²-2+2a²/ 2a²=3a-2/ 2a²
1/3x+y - 1/3x-y=3x-y-3x-y /(3x+y)(3x-y)=
= -2y/9x²-y²
4-3b/ b²-2b + 3/b-2=4-3b+6 /b(b-2)=
=10-3b/b²-2b
4/x²-4 - 1/x-2 - 1/x+2= 4-x-2-x+2 /x²-4=
=4-2x/ x²-4= 2(2-x)/ (x-2)(x+2)= -2(x-2)/ (x-2)(x+2)
= -2/ x+2
3a²+6/a³+1 - 3/a²-a+1 - 1/a+1=
=3a²+6-3a-3-a²+a-1 /a³+1=2a²-2a+2 / a³+1=
2(a²-a+1)/ (a²-a+1)(a+1)= 2/ a+1
2/ -1,4+1=2/ -0,4= 20/-4= -5