Question

va rog cat mai rapid!

Answer 1

Răspuns:

Explicație pas cu pas:

A = -4/5 + 3/4 = -16/20 + 15/20 = -1/20

B = 9/10 + 2/5 = 9/10 + 4/10 = 13/10 = 26/20

C = 3 +19/5 = 60/20 + 76/20 = 136/20

A + B - C = -1/20 + 26/20 - 136/20 = 25/20 - 136/20 = -111/20

Answer 2

$\it A=-\dfrac{^{4)}4}{\ 5}+\dfrac{^{5)}3}{\ 4}==\dfrac{-16+15}{20}=-\dfrac{1}{20}=-0,05\\ \\ \\ B=\dfrac{9}{10}+\dfrac{^{2)}2}{\ 5} =\dfrac{9+5}{10}=\dfrac{13}{10}=1,3\\ \\ \\ C= 3+\dfrac{19}{5}=3\dfrac{19}{5}=\dfrac{^{2)}34}{5}=\dfrac{68}{10}=6,8\\ \\ \\ A+B-C=-0,05+1,3-6,8=1,3-6,85=-5,55$