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a fost răspuns

scrie ca suma si diferenta de fractii cu numitori egali fiecare dintre fractiile 8/9 ,6/7, 5/10, 2/3, 3/5

Răspuns :

8/9=2/9+6/9=3/9+5/9=4/9+4/91/9+7/9                    (iti alegi care vrei la fiecare)
8/9=9/9-1/9=10/9-2/9=11/9-3/9=12/9-4/9...

6/7=1/7+5/7=2/7+4/7=3/7+3/7
6/7=7/7-1/7=8/7-2/7=9/7-3/7=10/7-4/7...

5/10=1/10+4/10=2/10+3/10
5/10=6/10-1/10=7/10-2/10=8/10-3/10=9/10-4/10...

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

3/5=1/5+2/5
3/5=4/5-1/5=5/5-2/5=6/5-3/5=7/5-4/5...

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