口算： + = - = - = 1- - =0.8- = 2- = &n

1. 口算：
$\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ = 1- $\text{[math]}$ - $\text{[math]}$ =
0.8- $\text{[math]}$ = 2- $\text{[math]}$ = $\text{[math]}$ +0.75= $\text{[math]}$ + $\text{[math]}$ - $\text{[math]}$ =

基础巩固换一批

1. 直接写得数。（8分）
6.5÷100= 4.8×0.1= 5÷7= 0.5×40=

$\frac{1}{6}$ － $\frac{1}{7}$ = $\frac{1}{3}$ ＋ $\frac{1}{4}$ = 0.5＋ $\frac{1}{2}$ = 0.75－ $\frac{3}{4}$ =

答案解析收藏纠错 + 选题
2. 口算.
$\frac{1}{7}$ + $\frac{1}{8}$ = $\frac{3}{4}$ - $\frac{1}{6}$ = $\frac{2}{9}$ + $\frac{7}{18}$ = $\frac{11}{19}$ + $\frac{8}{19}$ =
$\frac{1}{3}$ - $\frac{1}{5}$ = 3- $\frac{1}{2}$ = $\frac{7}{6}$ - $\frac{7}{12}$ = $\frac{9}{10}$ - $\frac{4}{5}$ =

答案解析收藏纠错 + 选题
3. 直接写得数
$\frac{1}{2}$ + $\frac{1}{3}$ ＝    $\frac{1}{2}$ ﹣ $\frac{1}{4}$ ＝    $\frac{2}{5}$ ﹣ $\frac{1}{5}$ ＝    $\frac{4}{7}$ ﹣ $\frac{1}{7}$ ＝    $\frac{7}{8}$ ﹣ $\frac{3}{8}$ ＝

$\frac{1}{10}$ + $\frac{2}{5}$ ＝    $\frac{5}{6}$ ﹣ $\frac{2}{3}$ ＝    $\frac{1}{3}$ + $\frac{1}{5}$ ＝      $\frac{3}{8}$ ﹣ $\frac{1}{4}$ ＝   $\frac{2}{3}$ + $\frac{1}{3}$ ＝

$\frac{3}{8}$ + $\frac{3}{8}$ ＝     $\frac{1}{2}$ ﹣ $\frac{1}{5}$ ＝    $\frac{4}{7}$ + $\frac{3}{7}$ ＝    1﹣ $\frac{7}{8}$ ＝     $\frac{5}{6}$ + $\frac{5}{6}$ ＝

1﹣ $\frac{5}{12}$ ＝     $\frac{3}{5}$ + $\frac{1}{2}$ ＝    $\frac{9}{10}$ ﹣ $\frac{3}{10}$ ＝    $\frac{5}{7}$ ﹣ $\frac{5}{7}$ ＝     $\frac{3}{8}$ + $\frac{5}{8}$ ＝

答案解析收藏纠错 + 选题

1. 口算： + = - = - = 1- - =0.8- = 2- = +0.75= + - =