Calculați: 11/15+7/10-4/5+1/2
va rog urgent

Răspuns:
11/25 + 7/10 - 4/5 + 1/2
= 11×2/25×2 + 7×5/10×5 - 4×10/5×10 + 1×25/2×25
= 22/50 + 35/50 - 40/50 + 25/50
= 22+35-40+25/50
= 42/50⁽²
= 21/25