Giá trị của N= -1/7 ( 9 1/2- 8.75) : 2/7 + 0,625: 1 2/3 là:

* Hướng dẫn giải

$N=-\frac{1}{7}\left(9\frac{1}{2}-8,75\right):\frac{2}{7}+0,625:1\frac{2}{3}$

$N=-\frac{1}{7}\left(\frac{19}{2}-\frac{875}{100}\right).\frac{7}{2}+\frac{625}{1000}:\frac{5}{3}$

$N=-\frac{1}{7}\left(\frac{19}{2}-\frac{35}{4}\right).\frac{7}{2}+\frac{5}{8}.\frac{3}{5}$

$N=-\frac{1}{7}.\frac{3}{4}.\frac{7}{2}+\frac{3}{8}$

$N=-\frac{3}{8}+\frac{3}{8}=0$