ajutati-ma plizz imi trebuie astazi dau coroana

Răspuns:
Explicație pas cu pas:
a. -2/5 - 3/10+1/2+4/15 =
1/2-3/10 + 4/15-2/5 = (5-3)/10 + (4-6)/15 = 2/10 - 2/15 = 6/30-4/30 = 2/30 = 1/15
b. -5/3 - 5/6 +5/2 -5/12 = (-10-5)/6 + (30-5)/12 = -15/6 + 25/12 = (25-30)/12 = -5/12