一、口算。
82 - 37 = 93×3 = 77÷7 =
46÷2 = 92 + 68 = 35×4 =
700×5 = 420÷4 = 50×60 =
950÷5 = 41×30 = 850 - 60 =
12×90 = 700÷2 = 438÷6 =
320×2 = 52×50 = 810÷3 =
$ \frac{2}{6} + \frac{3}{6} = $$ $$ \frac{7}{8} - \frac{7}{8} = $$ $$ \frac{9}{10} - \frac{7}{10} = $
$ \frac{7}{9} + \frac{1}{9} = $$ $$ \frac{5}{10} + \frac{1}{10} = $$ $$ \frac{6}{7} - \frac{2}{7} = $

一、45 279 11
23 160 140
3500 105 3000
190 1230 790
1080 350 73
640 2600 270
$\frac{5}{6} 0 \frac{2}{10}$
$\frac{8}{9} \frac{6}{10} \frac{4}{7}$

二、计算下面各题。
345 + (123 - 67) 836 - 18×37 385÷(403 - 396)
11×72 - 538 217 + 536÷8 68×(256 - 217)

二、401 170 55
254 284 2652