Question

Tính giá trị biểu thức

a,4/5 + 1 1/4 x 2 3/5

Answer 1

a: \(=\dfrac{4}{5}+\dfrac{5}{4}\cdot\dfrac{13}{5}=\dfrac{4}{5}+\dfrac{13}{4}=\dfrac{16+65}{20}=\dfrac{81}{20}\)

Answer 2

\(\dfrac{4}{5}+1\dfrac{1}{4} . 2\dfrac{3}{5}=\dfrac{4}{5}+\dfrac{5}{4} . \dfrac{13}{5}=\dfrac{4}{5}+\dfrac{13}{4}=\dfrac{16}{20}+\dfrac{65}{20}=\dfrac{81}{20}\)