1.
а) (5+9)/2=7
б) (-3+7)/2=2
в) (а+б)/2
2.
а) [ (3+1)/2 ; (2+4)/2 ] → (2;4)
б) [ (-3+(-1))/2 ; (-2+(-2))/2 ] → (-2;-2)
в) [ (a+c)/2 ; (b+d)/2 ]
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Answers & Comments
1.
а) (5+9)/2=7
б) (-3+7)/2=2
в) (а+б)/2
2.
а) [ (3+1)/2 ; (2+4)/2 ] → (2;4)
б) [ (-3+(-1))/2 ; (-2+(-2))/2 ] → (-2;-2)
в) [ (a+c)/2 ; (b+d)/2 ]