Răspuns:
a=24=2³·3
b=40=2³·5
cmmdc(24,40)=2³=8
se inmultesc toti factorii primi comuni, la puterile cele mai mici
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a=48=2⁴·3
b=54=2·3³
cmmdc(48,54)=2·3=6
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a=24=2³·3
b=12=2²·3
cmmdc(24,12)=2²·3=12
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a=54=2·3³
b=36=2²·3²
cmmdc(54,36)=2·3²=18
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a=30=2·3·5
b=40=2³·5
cmmdc(30,40)=2·5=10
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a=90=2·3²·5
b=135=3³·5
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cmmdc(90,135)=3²·5=45