Question

-3/4 + 1/5 + 0,7 + 4/5 + -1/4

Answer 1

\(-\dfrac{3}{4}+\dfrac{1}{5}+0,7+\dfrac{4}{5}+\left(-\dfrac{1}{4}\right)\)
\(=-\dfrac{3}{4}+\dfrac{1}{5}+\dfrac{7}{10}+\dfrac{4}{5}-\dfrac{1}{4}\)
\(=\left(-\dfrac{3}{4}-\dfrac{1}{4}\right)+\left(\dfrac{1}{5}+\dfrac{4}{5}\right)+\dfrac{7}{10}\)
\(=\left(-1\right)+1+\dfrac{7}{10}\)
\(=0+\dfrac{7}{10}\)
\(=\dfrac{7}{10}\)

Answer 2

\(\dfrac{-3}{4}\) + \(\dfrac{1}{5}\) + 0,7 + \(\dfrac{4}{5}\) + \(\dfrac{-1}{4}\) 

= \(\left[\left(\dfrac{-3}{4}\right)+\left(-\dfrac{1}{4}\right)\right]\) + \(\left(\dfrac{1}{5}+\dfrac{4}{5}\right)\) + 0,7

= (-1) + 1 + 0,7

= 0 + 0,7 = 0,7