Khai triển (x – 2y)6.

(x – 2y)⁶

$=C_6^0{x}^6+C_6^1{x}^5\left(-2y\right)+C_6^2{x}^4{\left(-2y\right)}^2+C_6^3{x}^3{\left(-2y\right)}^3$

$+C_6^4{x}^2{\left(-2y\right)}^4+C_6^{5}x{\left(-2y\right)}^5+C_6^6{\left(-2y\right)}^6$