Question

Tính: 

a)  \(25^{3\div}5^2\)

b)  \(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6\)

c)  \(3-\left(-\frac{6}{7}\right)^0+\left(\frac{1}{2}\right)^2\div2\)

Answer 1

a) \(25^3:5^2=5^6:5^2=5^4=625\)

b) \(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^9\)

c) \(3-\left(-\frac{6}{7}\right)^0+\left(\frac{1}{2}\right)^2:2=3-1+\frac{1}{8}=\frac{17}{8}\)

Answer 2

a) \(25^3:5^2=5^6:5^2=5^{6-2}=5^4\)