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b) 2/9 + 4/7 = 14/63+36/63= 50/63
c) 5/11 + 9/4 = 20/44+99/44=119/44
d) 5/10 + 3/5 = 25/10+30/10=55/10=11/2
e) 5/6 - 2/3 = 15/18-12/18=3/18=1/6
f) 3/4 - 1/7 = 21/28-4/28=17/28
i) 1/2 - 5/10 = 10/20-10/20=0
j) 2/3 - 1/8 = 16/24-3/24=13/24