\(\frac{85-17+34}{51-102}=\frac{102}{-51}=-2\)
Ta thấy:
\(\frac{85-17+34}{51-102}=\frac{17\cdot5-17+17\cdot2}{17\cdot3-17\cdot6}=\frac{17\cdot\left(5-1+2\right)}{17\cdot\left(3-6\right)}=\frac{17\cdot\left(4+2\right)}{17\cdot\left[3+\left(-6\right)\right]}=\frac{17\cdot6}{17\cdot-3}=-2\)
\(\frac{\left(17.5\right)-\left(17.1\right)+\left(17.2\right)}{\left(17.3\right)-\left(17.6\right)}\)
\(=\frac{17\left(5-1+2\right)}{17\left(3-6\right)}\)
\(=\frac{17.6}{17.\left(-3\right)}\)
\(=\frac{6}{-3}\)
\(=\left(-2\right)\)
