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va roggggg dau coroana !!!!​

Va Roggggg Dau Coroana class=

Răspuns :

M.a.=(a+b)/2=7,5

=>a+b=15

a=b+3

b+3+b=15

2b=12

b=6

a=9

Ma = ( a + b ) : 2 = 7, 5

a = 3 + b

a + b = 7, 5 × 2

a + b = 15

3 + b + b = 15

3 + 2 × b = 15

2 × b = 15 - 3

2 × b = 12

b = 12 : 2

b = 6

a = 3 + 6

a = 9