2:
a: \(=\dfrac{15}{16}:\left(\dfrac{3-4}{6}\right)^2=\dfrac{15}{16}\cdot\dfrac{36}{1}=\dfrac{540}{16}=\dfrac{270}{8}=\dfrac{135}{4}\)
b: \(=\dfrac{15}{34}+\dfrac{19}{34}-\dfrac{1}{3}-\dfrac{2}{3}-\dfrac{15}{17}=-\dfrac{15}{17}\)
c: \(=1+\dfrac{4}{23}-\dfrac{4}{23}+1=1+1=2\)
d: \(=\dfrac{3}{4}\left(26+\dfrac{2}{9}-38-\dfrac{2}{9}\right)=-12\cdot\dfrac{3}{4}=-9\)
e: \(=\dfrac{-5}{4}\left(35+\dfrac{1}{6}-45-\dfrac{1}{6}\right)=\dfrac{5}{4}\cdot10=\dfrac{50}{4}=\dfrac{25}{2}\)
f: =12*4/9+4/3
=16/3+4/3
=20/3
k: =-5/7(12,5+1,5)=-5/7*14=-10
l: =2,5+0,25+4,25-0,5
=2+4,5
=6,5
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