Tính :
a) 65 / 91 + -33 / 55
\(=\frac{5}{7}-\frac{3}{5}=\frac{4}{35}\)
b) 36 / -84 + 100 // 450
\(=\frac{-3}{7}+\frac{2}{9}=-\frac{13}{63}\)
c) -650 / 1430 + 588 / 686
\(=\frac{5}{11}+\frac{6}{7}=\frac{101}{77}\)
d) 2004 / 2010 + 8 / -670
=\(=\frac{334}{335}-\frac{4}{335}=\frac{66}{67}\)