Question

Dau coroana dar va rog urgent

Answer 1

Răspuns:

Explicație pas cu pas:

7.a) ²⁾9/25 + ⁵⁾1/10 = (18+5)/50 = 23/50

25 = 5 x 5   ; 10 = 2 x 5  => numitor comun = 2 x 5 x 5 = 50

7.b) 0,3 : 0,6  = 3/10 : 6/10  = 3/10 x 10/6 = 3/6⁽³ = 1/2

7.c) (-1/2) : (-2/3) + 3/4 : (-5/6) =

(-1/2) x (-3/2) + 3/4 x (-6/5) =

= 3/4 + (-18/20) = ⁵⁾3/4 - 18/20 = (15-18)/20 = -3/20

8) x = 12,65  ; y = 17,35

ma(x ; y) = (x+y)/2 = (12,65+17,35)/2 = 30/2 = 15

/ = impartire ; x = inmultire