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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