Question

решите систему уравнений

Answer 1

x+y=5 (x+y)(x2-xy+y2) =35 (x+y)/(x+y)(x2-xy+y2)=5/35 x2-xy+y2=7 (x+y)2-3xy=7 25-3xy=7 3xy=18 xy=6 x=5-y (5-y)*y=6 y2-5y+6=0 y=2 y=3 при y=2 x=3 при y=3 x=2