Question

[Phạm Tuấn Tài]

Tìm x,y,z biết: \(\frac{x}{12}=\frac{y}{9}=\frac{z}{5}\)và x.y.z=20

Answer 1

[Wang Jun Kai]

Đặt \(\frac{x}{12}=\frac{y}{9}=\frac{z}{5}=k\Rightarrow x=12k;y=9k;z=5k\)

\(xyz=12k.9k.5k=540.k^3=20\Rightarrow k^3=\frac{1}{27}\Rightarrow k=\frac{1}{3}\)

\(\Rightarrow x=12.\frac{1}{3}4;y=9.\frac{1}{3}=3;z=5.\frac{1}{3}=\frac{5}{3}\)

Tick đi Phạm Tuấn Tài

Answer 2

[Killer world]

x= 4

y= 3

z= \(\frac{5}{3}\)