Question

Tính:

a) 2x⁸/ x⁶ ; 48³ : 12³

b) 8⁶ . ( 0,125)⁴

c) 21⁶ / 81 . 49²

d) ( 2/3)² - (3/4)² . (-1)²⁰¹⁹

^{Giúp mình nha}

Answer 1

a) \(2x^8:x^6\)

\(=2x^2.\)

\(48^3:12^3\)

\(=\left(48:12\right)^3\)

\(=4^3\)

\(=64.\)

d) \(\left(\frac{2}{3}\right)^2-\left(\frac{3}{4}\right)^2.\left(-1\right)^{2019}\)

\(=\frac{4}{9}-\frac{9}{16}.\left(-1\right)\)

\(=\frac{4}{9}-\left(-\frac{9}{16}\right)\)

\(=\frac{145}{144}.\)

Chúc bạn học tốt!

Answer 2

a) $2x^8:x^6$

$=2x^2.$

${48}^3:{12}^3$

$={\left(48:12\right)}^3$

$=4^3$

$=64.$

d) ${\left(\frac{2}{3}\right)}^2-{\left(\frac{3}{4}\right)}^2.{\left(-1\right)}^{2019}$

$=\frac{4}{9}-\frac{9}{16}.\left(-1\right)$

$=\frac{4}{9}-\left(-\frac{9}{16}\right)$

$=\frac{145}{144}.$