Помигите плиз матем упр 580

Question

Помигите плиз матем упр 580

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Answer 1

А5\6
1)5/6+1/6=6/6
2)5/6-1/6=4/6


С-2/3
 -2/3+1/6=4/6+1/5=5/6
2/3-1/6=-4/6-1/6=3/6


В7/9
7/9+1/6=14/16+3/18=17/18
7/9+1/6=17/18-3/18=11/18