Răspuns:
- descompunerea numerelor intregi in factori primi
a) 75 = 3 × 5²
50 = 2 × 5²
- se inmultesc toti factorii primi comuni, la puterile cele mai mici
cmmdc (75; 50) = 5² = 25
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b) 40 = 2³ × 5
60 = 2² × 3 × 5
cmmdc (40; 60) = 2² × 5 = 20
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c) 80 = 2⁴ × 5
100 = 2² × 5²
cmmdc (80; 100) = 2² × 5 = 20
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d) 60 = 2² × 3 × 5
90 = 2 × 3² × 5
cmmdc (60; 90) = 2 × 3 × 5 = 30
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e) 48 = 2⁴ × 3
56 = 2³ × 7
cmmdc (48; 56) = 2³= 8
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f) 63 = 3² × 7
72 = 2³ × 3²
cmmdc (63; 72) = 3² = 9
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g) 66 = 2 × 3 × 11
44 = 2² × 11
cmmdc (66; 44) = 2 × 11 = 22
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h) 36 = 2² × 3²
54 = 2 × 3³
cmmdc (36; 54) = 2 × 3² = 18