Question

Calculeaza: a) (5/8-1/8+1-1/2):(25/13-1+1/13)
b){5/19*[9/40+17/24-(31/80+11/48)]}

Answer 1

a) (4/8+1/1-1/2):(25/13-1/1+1/13); amplificam pe 1/1 cu 8 si 1/2 cu 4, amplificam 1/1 cu 13
(4/8+8/8-4/8):(25/13-13/13+1/13)=
8/8:13/13= 8/8x13/13=104/104 simplificam prin 104 si e 1;