1)5(3b-4c)/10b=(3b-4c)/2b
2)5x(y+2)/6(y+2)=5x/6
3)(a-3b)/a(a-3b)=1/a
b) 15b-20c/10b = 5(3b-4c)/(10b) = (3b - 4c)/(2b).
g) 5x(y+2)/(6y+12) = 5x(y+2)/(6(y+2)) = 5x/6;
d)(a-3b)/(a^2-3ab) = (a-3b)/(a(a-3b))= 1/a.
