Question

Daca $\frac{x}{4}= \frac{y}{7}$ , atunci $\frac{9x-2y}{x+3y} = ?$

Answer 1

7x=4y;
⇒y=7x/4;
⇒9x-14x/4/x+21x/4
⇒9x-7x/2/x+21x/4
⇒18x/2-7x/2/4x/4+21x/4
⇒11x/2/25x/4
⇒11x/2·4/25x⇒se reduce x cu x;
⇒11/2 ·4/25
⇒11/1 ·2/25=22/25⇒fractie ireductibila;

Answer 2

x:4=y:7=k
x:4=4k
y:7=7k
(4kx9-7kx2):(4k+7kx3)=(36k-14k):(4k+21k)=22k:25k=22/25=0,88
Sper ca te-am ajutat!