Question

Tính nhanh

1/3 - 3/4 - 3/5 + 1/64 - 2/9 - 1/36 + 1/15

Answer 1

\(\dfrac{1}{3}-\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}\)

\(=\left(\dfrac{1}{3}-\dfrac{2}{9}-\dfrac{1}{36}\right)+(-\dfrac{3}{4}+\dfrac{1}{64})+(-\dfrac{3}{5}+\dfrac{1}{15})\)

\(=\left(\dfrac{12}{36}-\dfrac{8}{36}-\dfrac{1}{36}\right)+\left(-\dfrac{48}{64}+\dfrac{1}{64}\right)+(-\dfrac{9}{15}+\dfrac{1}{15})\)

\(=\dfrac{1}{12}+\dfrac{-47}{64}-\dfrac{8}{15}=\dfrac{80}{960}-\dfrac{705}{960}-\dfrac{512}{960}\)

\(\dfrac{80-705-512}{960}=-\dfrac{1137}{960}=-\dfrac{379}{320}\)

Answer 2

sai đề hay sao í