Упростить: а/b+a-1/a:a+b/ab при a=0,2 и b=0,3

1) a/b +(a-1)/a =(a² +b(a-1)) /ab =(a²+ab-b)/ab2) (a²+ab-b)/ab *ab/(a+b) =(a²+ab-b)/(a+b) =(0.04 +0.06 -0.3)/(0.2+0.3) = (-0.2)/(0.5) = -0.4