Toán làm hộ vs 3^6 . 45^4 -15^3 . 5^-9/ 27^4 . 25^3 +45^6 19/09/2021 By Kennedy làm hộ vs 3^6 . 45^4 -15^3 . 5^-9/ 27^4 . 25^3 +45^6
$\dfrac{3^6.45^4-15^3.5^{-9}}{27^4.25^3+45^6}$ $=\dfrac{3^6.(3^2.5)^4-(3.5)^3.5^{-9}}{(3^3)^4.(5^2)^3+(3^2.5)^6}$ $=\dfrac{3^6.3^85^4-3^3.5^3.5^{-9}}{3^{12}.5^6+3^{12}.5^6}$ $=\dfrac{3^{14}.5^4-3^3.5^{-6}}{2.3^{12}.5^6}$ $=\dfrac{3^2.5^{-2}-3^{-9}5^{-12}}{2}$ Trả lời
$\dfrac{3^6.45^4-15^3.5^{-9}}{27^4.25^3+45^6}$
$=\dfrac{3^6.(3^2.5)^4-(3.5)^3.5^{-9}}{(3^3)^4.(5^2)^3+(3^2.5)^6}$
$=\dfrac{3^6.3^85^4-3^3.5^3.5^{-9}}{3^{12}.5^6+3^{12}.5^6}$
$=\dfrac{3^{14}.5^4-3^3.5^{-6}}{2.3^{12}.5^6}$
$=\dfrac{3^2.5^{-2}-3^{-9}5^{-12}}{2}$
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