a. 1/3 - [tex]\frac{4*2}{3*5}[/tex]
= 1/3 - 8/15
= 1*5/3*5 - 8/15
= 5/15 - 8/15
= -3/15
b. (-3/3)*2/5
= -1 * 2/5
= -2/5
c. 1/3 + 4/3*5/2
=1/3 + 20/6
=2/6+20/6
=22/6 = 11/3
