Question

tính nhanh:

-2/7 + 3/4 - 5/7 - 7/4 + 17/3=?

tính giá trị biểu thức:

3 . 1/2 - (-52/8)⁰ + 1=?

Answer 1

  

Answer 2

\(\dfrac{-2}{7}+\dfrac{3}{4}-\dfrac{5}{7}-\dfrac{7}{4}+\dfrac{17}{3}\)
\(=\left(\dfrac{-2}{7}-\dfrac{5}{7}\right)+\left(\dfrac{3}{4}-\dfrac{7}{4}\right)+\dfrac{17}{3}\)
\(=\dfrac{-7}{7}+\dfrac{-4}{4}+\dfrac{17}{3}\)
\(=\left(-1\right)+\left(-1\right)+\dfrac{17}{3}\)
\(=\left(-2\right)+\dfrac{17}{3}\)
\(=\dfrac{11}{3}\)
\(-------\)
\(3.\dfrac{1}{2}-\left(\dfrac{-52}{8}\right)^0+1\)
\(=\dfrac{3}{2}-1+1\)
\(=\dfrac{3}{2}-\dfrac{2}{2}+\dfrac{2}{2}\)
\(=\dfrac{3}{2}\)