71. Simplify the following:
$$\frac{{{{\left( {0.1} \right)}^2} + {{\left( {0.01} \right)}^2} + {{\left( {0.009} \right)}^2} + 2\left[ {0.1 \times 0.01 + 0.01 \times 0.009 + 0.009 \times 0.1} \right]}}{{0.01 + 0.001 + 0.0009}}$$
$$\frac{{{{\left( {0.1} \right)}^2} + {{\left( {0.01} \right)}^2} + {{\left( {0.009} \right)}^2} + 2\left[ {0.1 \times 0.01 + 0.01 \times 0.009 + 0.009 \times 0.1} \right]}}{{0.01 + 0.001 + 0.0009}}$$
72. The value of $$\frac{4}{5} \div 3\frac{1}{4}{\text{ of }}\frac{8}{{13}} - \frac{{\frac{1}{5} - \frac{1}{8}}}{{\frac{1}{5} + \frac{1}{8}}} \times 5\frac{1}{5} + \frac{5}{6}\,{\text{is:}}$$
73. Which of the following statement is correct?
I. The value of 1002 - 992 + 982 - 972 + 962 - 952 + 942 - 932 + . . . . + 22 - 12 is 5050.
II. If 8x + $$\frac{8}{{\text{x}}}$$ = -16 and x < 0, then the value of x197 + x-197 is 2.
I. The value of 1002 - 992 + 982 - 972 + 962 - 952 + 942 - 932 + . . . . + 22 - 12 is 5050.
II. If 8x + $$\frac{8}{{\text{x}}}$$ = -16 and x < 0, then the value of x197 + x-197 is 2.
74. The value of $$\frac{3}{4} \times 2\frac{2}{3} \div \frac{5}{9}{\text{ of }}1\frac{1}{5} + \frac{2}{{23}} \times 3\frac{5}{6} \div \frac{2}{7}{\text{ of }}2\frac{1}{3}$$ is:
75. The value of $$3\frac{1}{3} \div 2\frac{1}{2}{\text{ of }}1\frac{3}{5} + \left( {\frac{3}{8} + \frac{1}{7} \times 1\frac{3}{4}} \right)$$ is:
76. Evaluate: {7 + 7 × (7 + 7 ÷ 7)} + 7 ÷ 7.
77. Find the simplest value of $$\frac{{6.25 - 1.96}}{{1.1}}.$$
78. Find the value of $$225 - \left[ {42 - \left\{ {25 - \left( {18 - \overline {18 + 13} } \right)} \right\}} \right].$$
79. The value of $$\frac{{33}}{{40}} + \frac{1}{5}\left[ {\frac{4}{5} - \frac{1}{5} \times \left( {\frac{7}{8} - \frac{5}{4}} \right)} \right]$$ is:
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