65 ; 42 = 53,5 46 ; 54 = 50
67 ; 49 = 58 53 ; 42 = 47,5
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a) ( 65 + 42 ) : 2 = 66 ( dư 1 )
b) ( 46 + 54 ) : 2 = 50
c) ( 67 + 49 ) : 2 = 58
d) ( 53 + 42 ) : 2 = 49
(65+42)÷2=54 dư 1
(46+54)÷2=50
(67+49)÷2=58
(53+42)÷2=47 dư 1
65:42=53,5
57:49=58
46:54=50
53:42=47,5
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