Question

Media aritmetica a doya nr. este -2 . Aflati numerele , stiind ca diferenta lor este 10

Answer 1

( a + b ) : 2 = -2
a - b = 10
a = 10 + b
( 10 + b + b ) : 2 = -2
( 10 + 2b ) : 2 = -2
10 + 2b = -2 x 2
10 + 2b = -4
2b = -4 -10
2b = -14
b = -14 : 2
b = - 7
a = 10 + (-7)
a = 3

Answer 2

$\frac{a+b}{2}$=-2⇒a+b=-4⇒a=-4-b

a-b=10⇒-4-b-b=10⇒-4-2b=10⇒-2b=14⇒b= -7

a-b=10⇒a+7=10⇒a=10-7⇒a=3