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Dianageorgiana794id

Răspuns:

a/b=4=>a=4b

a-b=18

4b-b=18=>b=18:3=>b=6

a=4·6=>a=24

Ma=(a+b)/2=>Ma=(24+6)/2=30/2=15

a / b = 4

a - b = 18

a = 4 b

4 b - b = 18

3 b = 18 | : 3

b = 6

a = 4 × 6

a = 24

Ma = ( a + b ) : 2 = ( 24 + 6 ) : 2 = 30 : 2 = 15

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