Answer 1

\(b,\left(\dfrac{7}{41}-\dfrac{4}{9}\right)-\left(\dfrac{3}{19}+\dfrac{7}{41}\right)+\left(\dfrac{4}{9}-\dfrac{16}{19}\right)=\dfrac{7}{41}-\dfrac{4}{9}-\dfrac{3}{19}-\dfrac{7}{41}+\dfrac{4}{9}-\dfrac{16}{19}=\left(\dfrac{7}{41}-\dfrac{7}{41}\right)+\left(\dfrac{-4}{9}+\dfrac{4}{9}\right)+\left(\dfrac{-3}{19}-\dfrac{16}{19}\right)=0+0+\left(-1\right)=-1\)