Toán Lớp 8: Rút gọn phân thức
c/ 3^3x – 3^3y / 3^x – 3^y
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Toán Lớp 8: Rút gọn phân thức
c/ 3^3x – 3^3y / 3^x – 3^y
Comments ( 2 )
$=\dfrac{3^{3+x}-3^{3+y}}{3^{x}-3^{y}}$
$=\dfrac{3^3.3^x-3^3.3^y}{3^{x}-3^{y}}$
$=\dfrac{3^3(3^{x}-3^{y})}{3^{x}-3^{y}}$
$=3^3$
$=27$