Question

Tính:  a) \(\sqrt{99}:\sqrt{11}\);               b) \(\sqrt{7,84}\);               c) \(\sqrt{1815}:\sqrt{15}\).

Answer 1

a) \(\sqrt {99} :\sqrt {11}  = \sqrt {99:11}  = \sqrt 9  = 3\)

b) \(\sqrt {7,84}  = \sqrt {784:100}  = \sqrt {784} :\sqrt {100}  = 28:10 = 2,8\)

c) \(\sqrt {1815} :\sqrt {15}  = \sqrt {1815:15}  = \sqrt {121}  = 11\)