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(a) 1/6 + 8/4 =
(b) 7/2 + 2/9 =
(c) 4/10 + 1/3 =
(d) 8/2 - 2/8 =
(e) 6/2 - 1/9 =
(f) 9/4 - 3/8 =

Aiuda pliss