Question

Answer 1

a: \(\frac74+\frac{-3}{5}=\frac{35-12}{20}=\frac{23}{20}\)

b: \(2021-\left(\frac13\right)^2\cdot3^2=2021-\frac19\cdot9=2021-1=2020\)

c: \(7,5\cdot\left(-\frac35\right)=-\frac{22.5}{5}=-4,5\)

d: \(\left(-\frac14\right)^2\cdot\frac{7}{11}+\frac{4}{11}\cdot\left(-\frac14\right)^2\)

\(=\frac{1}{16}\cdot\frac{7}{11}+\frac{4}{11}\cdot\frac{1}{16}\)

\(=\frac{1}{16}\left(\frac{7}{11}+\frac{4}{11}\right)=\frac{1}{16}\)