12.
a) 1/2 - 1/3 (aducem la acelasi numitor)
(3-2) / 6 = 1/6
r) (5+2/5)+(1+3/10)-(2+1/3)-(1+5/6)-1/2
bagam intregii in fractie
27/5 + 13/10 - 7/3 - 11/6 - 1/2
aducem la acelasi numitor -> 30
(162 + 39 - 70 - 55 - 15) / 30 = 61 / 30 = 2 intregi si 1/30
13.
a) 1/2 + 1/4 + 1/8 (aducem la acelasi numitor)
(4+2+1) / 8 = 9/8 = 1 intreg si 1/8
g) 17/8 - 1/12 - 5/24 - 1/3 (aducem la acelasi numitor= 24)
(51 - 2 - 5 - 8) / 24 = 36 / 24 (simplificam cu 12)
si 36 / 24 = 3 / 2 sau 1 intreg si 1 / 2
pov. am facut primul si subpt care mi s a parut cel mai dificil, dar in rest cred ca te poti descurca de la asteasucces!
