... chng Ngy son: 8 /11/ 08 35 = { ( 1, 2,3) , ( 1, 2, ) , ( 1,3, ) , ( 2,3, ) } ( n ( ) = C43 = ) b) A = { ( 1,3, ) } , n ( A ) = B = { ( 1, 2,3) , ( 2,3, ) } , n ( B ) = Ngy dy: 11B1: 11B3: 11B4: ... -Nhn xột VD2 : (sgk) VD3 : (sgk) VD4: (sgk) BT1/SGK/74 : a) = { ( i, j ) /1 i, j 6} b) A = { ( 4, ) , ( 6, ) , ( 5,5 ) , ( 5, ) (...
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21/07/2013, 01:25