ai đó giúp mik vs ạ C = 12 15x12/15x4y^2.5 9 xy 5/9xy

 #xin ctlhn, camon, 5sao

C = $\frac{12}{15}$  . $\frac{12}{15}$  . 4y² . $\frac{5}{9}$xy .$\frac{5}{9}$xy

C = $\frac{16}{25}$  . 4y² . ($\frac{5}{9}$ . $\frac{5}{9}$) . (x . x) . (y . y)

C = $\frac{64}{25}$ y² . $\frac{25}{81}$ x²y²

C = ($\frac{64}{25}$ . $\frac{25}{81}$) . (y² . y²) . x²

C = $\frac{64}{81}$ $y^{4}$ x²

Bậc: 6 (do 4 + 2 = 6)

@NT