Question

Bài 1 : Rút gọn phân số : a,-215/340 b, 25.13/26.35 c, -2017.2016+1/(-2015).(-2017)+2016

Answer 1

a) \(-\dfrac{215}{340}=-\dfrac{43}{68}\)

b) \(\dfrac{25\cdot13}{26\cdot35}=\dfrac{5}{2\cdot7}=\dfrac{5}{14}\)

c) \(\dfrac{-2017\cdot2016+1}{-2015\cdot\left(-2017\right)+2016}=-1\)

Answer 2

\(a,\dfrac{-215}{340}=\dfrac{-215:5}{340:5}=\dfrac{-43}{68}\)

\(b,\dfrac{25.13}{26.35}=\dfrac{5.5.13}{2.13.7.5}=\dfrac{5}{2.7}=\dfrac{5}{14}\)

\(\dfrac{-2017.2016+1}{-2015.-2017+2016}=-1\)