1)4/9b+2/3 при b=6 2)3/5+1 1/4а при а =2 3)2 3/10b+1/2 по b=5

1)4/9b+2/3 при b=6 4/9*6+2/3=2 1/3+2/3=3 2)3/5+1 1/4а при а =2 3/5+2 1/2=6/10+2 5/10=3 1/10 3)2 3/10b+1/2 по b=5 11 1/2+1/2=12