Question

Produsul a doua numere rationale pozitive este 80.Aflati numerele stiind ca 60% din primul numar reprezinta 70% din al 2-lea numar.


Rezolvati in Z ecuatia : xy+x -2y =3


Va roog dau coroana si multe puncte

Answer 1

1)
x-primul
y-al doilea
x*y=80
60/100x=70/100y

x*y=80
0,6x=0,7y

x*y=80
y=6/7x

x*6/7x=80
y=6/7x

6/7x²=80
y=6/7x

x²=80*7/6
y=6/7x

x²=280/3
y=6/7x

x=+/-2√210/3
y=6/7*+/-2√210/3

x₁/₂=+/-2√210/3
y₁/₂=+/-4√210/7

Verificare:
2√210/3*4√210/7=1680/21=80,deci 80=80;
-2√210/3*(-4√210/7)=1680/21=80,deci 80=80

Urmatorul munceste independent.
Bafta!

                                             

Answer 2

Am atasat rezolvarea.