71.
If $$3a = 4b = 6c$$   and $$a + b + c = 27\sqrt {29} {\text{,}}$$    then $$\sqrt {{a^2} + {b^2} + {c^2}} $$    is ?

72.
The square root of $${\text{0}}{\text{.}}\overline {\text{4}} $$  is ?

73.
$$\sqrt {0.2} = ?$$

74.
The value of $$\sqrt {0.121} $$   is = ?

75.
The value of $$\sqrt {\frac{{0.16}}{{0.4}}} $$   is = ?

76.
The value of $$\frac{{1 + \sqrt {0.01} }}{{1 - \sqrt {0.1} }}$$   is close to = ?

77.
The square root of 535.9225 is = ?

78.
If 1537* is a perfect square, then the digit which replace * is = ?

79.
If $$\sqrt 5 = 2.236{\text{,}}$$   then the value of $$\frac{1}{{\sqrt 5 }}$$  is = ?

80.
If $$\sqrt {24} = 4.889,$$   the value of $$\sqrt {\frac{8}{3}} $$   is = ?

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