Question

Giải chi tiết giúp mình với! Mình để ảnh bài tập dưới phần bl ạ

Answer 1

  Tính hợp lý

Answer 2

\(12)\)

\(\sqrt{0,49}.\left(\dfrac{1}{\sqrt{81}}+\dfrac{1}{3}-1\right)+\left(0,4\right)^5.\left(\dfrac{5}{2}\right)^5\)

\(=0,7.\left(\dfrac{1}{9}+\dfrac{1}{3}-1\right)+0,01024.\dfrac{3125}{32}\)

\(=0,7.\left(\dfrac{1}{9}+\dfrac{3}{9}-1\right)+0,01024.\dfrac{3125}{32}\)

\(=0,7.\left(\dfrac{4}{9}-1\right)+0,01024.\dfrac{3125}{32}\)

\(=0,7.\dfrac{-5}{9}+0,01024.\dfrac{3125}{32}\)

\(=\dfrac{-7}{18}+0,01024.\dfrac{3125}{32}\)

\(=\dfrac{-7}{18}+1\)

\(=\dfrac{11}{18}\)

Answer 3

`12,` \(\sqrt{0,49}\cdot\left(\dfrac{1}{\sqrt{81}}+\dfrac{1}{3}-1\right)+\left(0,4\right)^5\cdot\left(\dfrac{5}{2}\right)^5\)

\(=0,7\cdot\left(\dfrac{1}{9}+\dfrac{1}{3}-1\right)+\left(0,4\cdot\dfrac{5}{2}\right)^5\)

\(=0,7\cdot-\dfrac{5}{9}+1\)

`= -7/18+1=11/18`