Question

\(\frac{3}{2}x=\frac{2}{3}y;2x^3-1=15\)
tìm x và y

Answer 1

\(2x^3-1=15\Rightarrow2x^3=16\Rightarrow x^3=8\Rightarrow x^3=2^3\Rightarrow x=2\)

Thay x = 2 vào  ta có 

\(\frac{3}{2}.2=\frac{2}{3}.y\Rightarrow\frac{2}{3}y=3\Rightarrow y=3:\frac{2}{3}=3\cdot\frac{3}{2}=\frac{9}{2}\)