Question

Tính:

a) \(\sqrt{1600}\);                  b) \(\sqrt{0,81}\);                 c) \(\sqrt{\dfrac{9}{25}}\).

Answer 1

a) \(\sqrt {1600}  = \sqrt {{{40}^2}}  = 40\)

b) \(\sqrt {0,81}  = \sqrt {{{(0,9)}^2}}  = 0,9\)

c) \(\sqrt {\frac{9}{{25}}}  = \sqrt {{{\left( {\frac{3}{5}} \right)}^2}}  = \frac{3}{5}\)