Answer:
a)
-4/5 + 3/10 = -8/10 + 3/10 = -5/10 = -1/2
b)
2 5/8 - 1 1/3 = 2 15/24 - 1 8/24 = 2 - 1 + 15/24 - 8/24 = 1 7/24
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