URGENTE Calcule e simplifique o resultado das frações, quando for possível:

4.a) 2/3 + 3/4
4.b) 4/5 + 11/6
4.c) 3/4 + 5/8
4.d) 5/6 - 1/5
4.e) 3/4 - 1/6
4.f) 7/8 - 4/9
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