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Verified answer
a) 3/4 + 1/4 =13/8 + 5/8 = 1
1 4/5 - 4/5 = 1
b) 1 - 1/2 = 1/2
2 1/4 + 1 3/4 = 4
1 3/4 - 5/4 = 1/2
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