Question

tim a,b biet : a+b=ab=a/b

Answer 1

ta co ;a+b = ab=>a=ab-b=>a=b(a-1)

a+b=a/b=>a/bthay a=b(á-1)vào vế phải

=>a+b=b(a-1)/b=a-1

a+b=a-1=>b=-1   Tacoa+b =ab thay b=-1 ta co a+-1=-1a=>a-1=-a =>2a=-1=>a=-1/2

vay b =-1 a=-1/2