找出每组数的最大公因数:({5i4d4}5x*d7Z*^(]-U1~(t(z7h/A*E
(1)12和20 6U(Z4J;B;m3[/^6t1B7]7Z5a*[3K({5i4d4}5x*d7Z*^(]-U1~(t(z7h/A*E
(2)4和7 ._5e3S1C0n'Z({5i4d4}5x*d7Z*^(]-U1~(t(z7h/A*E
(3)8和16 :R.l9G,@6V)w9]/y0@1]1z7p({5i4d4}5x*d7Z*^(]-U1~(t(z7h/A*E
(4)1和24 .@;P5m3B6G.~5I8p6u8@0H1q5H(M({5i4d4}5x*d7Z*^(]-U1~(t(z7h/A*E