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a)
546/2= 273/3= 91/7= 13/13 =1
306/2= 153/3= 51/17= 3/3=1
15/3= 5/5 =1
21/3= 7/7= 1
NWD (546, 306)=2*3=6
NWW(15,21)=105 (obliczasz 15*7 lub 21*5)
NWD+NWW=6+105=111
b)
21/3= 7/7= 1
28/4= 7/7= 1
84/2= 42/2= 21/3= 7/7= 1
630/2= 315/3= 105/3= 35/5= 7/7= 1
NWW(21,28)=588 (obliczasz 21*4*7 lub 28*3*7)
NWD(84,630)=42 (obl. 2*3*7)
NWW+NWD=588+42=630
Pozdrawiam.