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DESCOPĂR:
13 – 5 = 10 + 3 – 5
13 – 5 = 8
10 3
3
= 10 – 5+ 3
=5+3
=8
20 - 3 = 10 + 10-3
20 – 3 = 17
10 10
= 10 + 10-3
= 10 + 7
= 17​