Question

Bài 1 Thực hiện phép tính 

a)[ 1/3]⁵⁰ . (-9)²⁵-2/3:4

b) 3² .1/243.81².1/3²

Answer 1

a) \(\left[\frac{1}{3}\right]^{50}.\left(-9\right)^{25}-\frac{2}{3}:4\)

\(\Rightarrow\frac{1}{3^{50}}.\left(-9\right)^{25}-\frac{2}{3}.\frac{1}{4}\)

\(\Rightarrow\frac{\left(-9\right)}{9^{25}}-\frac{1}{6}\)

\(\Rightarrow1-\frac{1}{6}\)

\(\Rightarrow\frac{6}{6}-\frac{1}{6}=\frac{5}{6}\)

Vậy = 5/6