Question

a,7/4+-3/5

b,2021-(1/3)^2 x 3^2

c,7,5 x(-3/5)

d,(-1/4)^2 x 4/11+7/11 x(-1/4)^2

e, A= 1/4 +1/4^2+1/4^3+...+1/4^2020<1/3

Answer 1

a: \(\dfrac{7}{4}+\dfrac{-3}{5}=\dfrac{35-12}{20}=\dfrac{23}{20}\)

d: \(\left(-\dfrac{1}{4}\right)^2\cdot\dfrac{4}{11}+\dfrac{7}{11}\cdot\left(-\dfrac{1}{4}\right)^2=\dfrac{1}{16}\)

Answer 2

\(\dfrac{7}{4}+\dfrac{-3}{5}=\dfrac{35}{20}+\dfrac{-12}{20}=\dfrac{23}{20}\)