Question

\(\dfrac{3}{8}+2^2+\dfrac{3}{8}\)

Tính hợp lý nếu có thể

Answer 1

3/8+4/1+3/8=(3/8+3/8)+4/1=3/4+4/1

=3/4+12/4=15/4

Answer 2

\(\dfrac{3}{8}\)+\(2^2\)+\(\dfrac{3}{8}\)

= ( \(\dfrac{3}{8}+\dfrac{3}{8}\))+\(2^2\)

=\(\left(\dfrac{3}{8}\right)^2+2^2\)

=\(\left(\dfrac{3}{8}\right)^2+\left(\dfrac{16}{8}\right)^2\)

=\(\left(\dfrac{3}{8}+\dfrac{16}{8}\right)^2\)

=\(\left(\dfrac{19}{8}\right)^2\)

=\(\dfrac{361}{64}\)