Question

Calculati media aritmetica a numerelor: -1supra4, 2supra3 si -5supra9.

Answer 1

$\frac{ \frac{ - 1}{4} + \frac{2}{3} \ + \frac{ - 5}{9} }{3} = \frac{ \frac{ - 9 + 24- 20}{36} }{3} = \frac{ \frac{ - 5}{36} }{3} = \frac{ - 5}{36*3} = \frac{ - 5}{108}$

Answer 2

Răspuns

Explicație pas cu pas:

[ ( - 1 / 4) + 2 / 3 + ( - 5 / 9 ) ] : 3 = - 5 / 108 → media aritmetica

→ c.m.m.m.c al numitorilor ( 4; 3  si 9 ) = 4 x 9 = 36

→ aduc fractiile la acelasi numitor comun 36

= [ ( - 1 × 9 ) / 36  + ( 2 × 12 ) / 36+ ( - 5 × 4 ) / 36 ] : 3 =

= ( - 9 + 24 - 20 ) / 36  × 1 / 3 =

= - 5 / ( 36 × 3 ) =

= - 5 / 108