登录
一、口算。
$\frac{1}{5}÷\frac{5}{9}=$
$\frac{1}{7}×\frac{7}{8}=$
$\frac{1}{30}+\frac{1}{2}=$
$0.55÷11=$
$5.7÷19\%=$
$\frac{3}{5}+\frac{7}{20}=$
$5.68 + 2.5=$
$\frac{1}{5}÷\frac{5}{9}=$
$\frac {9}{25}$
27. $3 - 3.3=$24
$\frac{2}{5}+\frac{1}{3}=$$\frac {11}{15}$
$\frac{1}{7}×\frac{7}{8}=$
$\frac {1}{8}$
$380×20=$7600
$\frac{1}{5}÷\frac{3}{10}=$$\frac {2}{3}$
$\frac{1}{30}+\frac{1}{2}=$
$\frac {8}{15}$
$12÷\frac{3}{4}=$16
$2 - 1.46=$0.54
$0.55÷11=$
0.05
$\frac{4}{5}+\frac{1}{6}=$$\frac {29}{30}$
$1.7×30=$51
$5.7÷19\%=$
30
$\frac{3}{28}×\frac{7}{30}=$$\frac {1}{40}$
$2.5 + 0.75=$3.25
$\frac{3}{5}+\frac{7}{20}=$
$\frac {19}{20}$
$\frac{6}{11}÷\frac{3}{11}=$2
$\frac{1}{9}-\frac{1}{16}=$$\frac {7}{144}$
$5.68 + 2.5=$
8.18
$4.25÷0.85=$5
$9 - 0.38=$8.62
答案
一、$\frac {9}{25}$ 24 $\frac {11}{15}$
$\frac {1}{8}$ 7600 $\frac {2}{3}$
$\frac {8}{15}$ 16 0.54
0.05 $\frac {29}{30}$ 51
30 $\frac {1}{40}$ 3.25
$\frac {19}{20}$ 2 $\frac {7}{144}$
8.18 5 8.62
$\frac {1}{8}$ 7600 $\frac {2}{3}$
$\frac {8}{15}$ 16 0.54
0.05 $\frac {29}{30}$ 51
30 $\frac {1}{40}$ 3.25
$\frac {19}{20}$ 2 $\frac {7}{144}$
8.18 5 8.62
二、计算下面各题，怎样简便就怎样计算。
$2.6×99 + 2.6$ $12 - 5÷9-\frac{1}{9}×13$ $\frac{1}{9}÷(\frac{5}{6}-50\%)÷\frac{8}{9}$
$\frac{10}{7}-\frac{10}{11}-\frac{1}{11}-\frac{3}{7}$ $360÷15 + 2.5×16$ $\frac{1}{4}÷[(\frac{11}{12}-\frac{3}{4})×\frac{3}{7}]$
$2.6×99 + 2.6$ $12 - 5÷9-\frac{1}{9}×13$ $\frac{1}{9}÷(\frac{5}{6}-50\%)÷\frac{8}{9}$
$\frac{10}{7}-\frac{10}{11}-\frac{1}{11}-\frac{3}{7}$ $360÷15 + 2.5×16$ $\frac{1}{4}÷[(\frac{11}{12}-\frac{3}{4})×\frac{3}{7}]$
答案
二、260 10 $\frac {3}{8}$
0 64 $\frac {7}{2}$
0 64 $\frac {7}{2}$
