Răspuns:
pentru a afla cel mai mic numitor comun al fractiilor date ,calculam cmmmc al numitorilor
1/6 , 7/9
6=2·3
9=3²
cmmmc(6,9)=2·3²=18
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1/54 , 7/81
54=2·3³
81=3⁴
cmmmc(54,81)=2·3⁴=162
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3/13 , 4/3
cmmmc=13·3=39
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7/120 , 11/540
120=2³·3·5
540=2²·3³·5
cmmmc(120,540)=2³·3³·5=1080
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60/144 , 126/216
144=2⁴·3²
216=2³·3³
cmmmc(144,216)=2⁴·3³=432
