Question

1. Tính.

 

a) \(\left(\frac{2}{3}\right)^3\)       b) \(\left(-2\frac{3}{4}\right)^2\)      c) (0,6)\(^4\)     d) \(\left(\frac{-1}{2}\right)^4\)      e) \(\left(\frac{-1}{2}\right)^5\)

 

2. viết mỗi số \(\frac{81}{125}\) ; \(\frac{-8}{27}\) dưới dạng 1 lũy thừa.

 

b) viết các số: (0,36)\(^3\) :  b) \(\left(-\frac{4}{11}\right)^2\) :  c) (0,5)\(^4\) . 6\(^4\) :  d) \(\left(\frac{2}{5}\right)^5.x=\left(\frac{2}{5}\right)^8\)

 

3. tìm x

 

a) x : \(\left(\frac{3}{4}\right)^3=\left(\frac{3}{4}\right)^2\)       b) \(\left(\frac{2}{5}\right)^5.x=\left(\frac{2}{5}\right)^8\)

 

 

giúp mk nhé mai mk nộp bài tp r thanks

Answer 1

Câu 1:

a)\(\left(\frac{2}{3}\right)^2=\frac{4}{9}\)               b)\(\left(-2\frac{3}{4}\right)^2=\left(-\frac{11}{4}\right)^2=\frac{121}{16}\)

c)\(\left(0,6\right)^4=\left(\frac{3}{5}\right)^4=\frac{81}{625}\)           d)\(\left(-\frac{1}{2}\right)^4=\frac{1}{16}\)

e)\(\left(-\frac{1}{5}\right)^5=\frac{-1}{3125}\)

Answer 2

bn đăg từng bài thui nhé

Answer 3

Câu 2:Sai đề

Câu 3:

a)\(x:\left(\frac{3}{4}\right)^3=\left(\frac{3}{4}\right)^2\)

   \(x:\frac{27}{64}=\frac{9}{16}\)

    \(x=\frac{243}{1024}\)

Vậy \(x=\frac{243}{1024}\)

b)\(\left(\frac{2}{5}\right)^5.x=\left(\frac{2}{5}\right)^8\)

    \(x=\left(\frac{2}{5}\right)^8:\left(\frac{2}{5}\right)^5\)

    \(x=\left(\frac{2}{5}\right)^3\)

    \(x=\frac{8}{125}\)

Vậy \(x=\frac{8}{125}\)

 

Answer 4

câu 2 . \(\frac{81}{125}=\frac{3^4}{5^3}\)

             \(\frac{-8}{27}=\frac{\left(-2\right)^3}{3^3}\)