Răspuns:
Explicație pas cu pas:
Pentru rezolvarea acestor exercitii este nevoie sa aducem
fractiile la acelasi numitor .
Avem urmatoarele notatii :
³⁾1/8 = amplificare ; 185/20⁽⁵ = simplificare
a) ²⁾7/12 - ³⁾1/8 = (14-3)/24 = 11/24
b) ⁴⁾11/15 - ³⁾7/20 = (44-21)/60 = 23/60
c) ⁴⁾17/12 - ³⁾3/16 = (68-9)/48 = 59/48
d) 25/18 - 5/15⁽⁵ = 25/18 - ⁶⁾1/3 = (25-6)/18 = 19/18
e) 5 intregi 5/6 - 1 intreg 1/4 = (5·6+5)/6 - (1·4+1)/4 =
= ²⁾35/6 - ³⁾5/4 = (70-15)/12 = 55/12
f) 7 intregi 7/18 - 6 intregi 1/12 = (7·18+7)/18 - (6·12+1)/12 =
= ²⁾133/18 - ³⁾73/12 = (266-219)/36 = 47/36
g) 8 intregi 11/45 - 7 intregi 1/30 = (8·45+11)/45 - (7·30+1)/30 =
= ²⁾371/45 - ³⁾211/30 = (742-633)/90 = 109/90
h) 9 intregi 13/24 - 9 intregi 5/20 = (9·24+13)/24 - (9·20+5)/20 =
= 229/24 - 185/20⁽⁵ = 229/24 - ⁶⁾37/4 = (229-222)/24 = 7/24
l) 9 intregi 17/24 - 8 intregi 3/4 = (9·24+17)/24 - (8·4+3)/4 =
= 233/24 - ⁶⁾35/4 = (233-210)/24 = 23/24