\(\left(3+\dfrac{4}{5}-\dfrac{5}{12}\right).\left(\dfrac{6}{7}-\dfrac{3}{5}\right)^2\)
\(=\left(\dfrac{19}{5}-\dfrac{5}{12}\right).\left(\dfrac{9}{35}\right)^2\)
\(=\dfrac{203}{60}.\dfrac{81}{1225}\)
\(=\dfrac{783}{3500}\)
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\(1-\dfrac{2}{\sqrt{225}}-\dfrac{2}{5\sqrt{49}}-\dfrac{\sqrt{4^0}}{63}\)
\(=1-\dfrac{2}{15}-\dfrac{2}{5.7}-\dfrac{\sqrt{1}}{63}\)
\(=\dfrac{13}{15}-\dfrac{2}{35}-\dfrac{1}{63}\)
\(=\dfrac{17}{21}-\dfrac{1}{63}\)
\(=\dfrac{50}{63}\)
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