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1.calculează mulțimea divizorilor comuni :(30,84),(440,154),(160,280),(51,170),(180,550),(250,325),(21,49,70),(140,315,245),(240,300,180),(180,216,72),(125,375,225),(121,1001,77).

Răspuns :

30=2*3*5 si 84=2^2*7*3 deci cmmdc=2*3=6
440=2^3*5*11 si 154=2*11*7 deci cmmdc=2*11=22
160=2^5*5 si 280=2^3*7*5 deci cmmdc=2^3*5=40
51=3*17 si 170=17*2*5 deci cmmdc=17
180=3^2*2^2*5 si 550=5^2*2*11 deci cmmdc=2*5=10
250=5^3*2 si 325=5^2*13 deci cmmdc=5^2=25
21=7*3,49=7^2 si 70=7*2*5 deci cmmdc=7
140=7*2^2*5 ,315=5*3^2*7 si 245=5*7^2 deci cmmdc=7
240=3*2^4*5, 300=3*2^2*5^2 si 180=3^2*2^2*5 deci cmmdc=3*2^2*5=60
180 e mai sus, 216=2^3*3^3 si 72=2^3*3^2 deci cmmdc=36
125=5^3, 375=5^3*3 si 225=5^2*3^2 deci cmmdc=5^2=25
121=11^2, 1001=11*7*13 si 77=7*11 deci cmmdc=11