Question

[Khánh Linh]

BT1: Tính nhanh

3) \(\dfrac{1}{2}-\dfrac{3}{2}.\left(\dfrac{1}{2}-\dfrac{1}{3}\right)+\left(\dfrac{-3}{-2^3}\right)\)

4) \(\dfrac{1}{12}.\dfrac{37}{39}+\dfrac{1}{12}.\dfrac{2}{39}+\dfrac{1}{4}\)

Answer 1

[Đinh Như]

\(\dfrac{1}{12}\). \(\dfrac{37}{39}+\dfrac{1}{12}.\dfrac{2}{39}+\dfrac{1}{4}\)

=\(\dfrac{1}{12}.\left(\dfrac{37}{39}+\dfrac{2}{39}\right)+\dfrac{1}{4}\)

=\(\dfrac{1}{12}.1+\dfrac{1}{4}\)

=\(\dfrac{13}{12}+\dfrac{1}{4}\)

=\(\dfrac{16}{12}\)