a. 1/2 + 1/3 +1/6 2.a 2/9 + 1/5 +7/9 +4/5
= 5/6 +1/5 = (2/9 + 7/9 )+(1/5 + 4/5 )
= 6/6 = 1 =1 + 1
b. 5/12 + 5/6 - 3/4 = 2
= 5/4 - 3/4 2.b 1/12+3/16+5/12+5/16
= 2/4 = 1/2 = (1/12 + 5/12 )+(3/16 + 5/16 )
c. 1-(1/5 + 1/2 ) =1/2 + 1/2
= 1 - 7/10 = 1
= 3/10