Bài 10 : So sánh : 
a, (-5) ³⁹ và (-2) ⁹¹
b, A = \(\dfrac{9^{2018}+1}{9^{2019}+1}v\text{à}\) \(\dfrac{9^{2019}+1}{9^{2020}+1}\)

T = [ (2,1²- 4,01)². 2,5 + 7,3 ] : [1,9 - 0,4² - \(\left(\dfrac{4}{5}\right)^2\)

Tính giá trị biểu thức :

A = \(\left(\dfrac{5}{4}-0,5\right)^2+\left(\dfrac{-1}{2}\right)^4\)
B = 2 ⁴ + 8 \(\text{[}\left(-3\right)^2:\dfrac{1}{2}\)] - 3² . 4 + (-2)³
C = 1 : 0,25 . (1 \(\dfrac{1}{4}\))² - (3 \(\dfrac{1}{5}\)-20%).(-1 \(\dfrac{1}{3}\))²+\(\dfrac{7}{12}\)

Tính :
a, 2 ³ + 3 . \(\left(\dfrac{1}{2}\right)^0\) - 2 ² . 4 + \(\text{[}\left(-2\right)^2:\dfrac{1}{2}\)] . 8
b, \(\left(\dfrac{2}{3}\right)^2:\left(-2^3\right)-\left[\left(-\dfrac{1}{2}\right)^2+\dfrac{3^2}{20}\right]:\dfrac{7}{5}\)