一、口算。
$65\%-0.35=$
$31.8÷1000=$
$0.44÷2.2=$
$5.6-1.8=$
$\dfrac{13}{15}÷\dfrac{13}{14}=$
$\dfrac{3}{5}+40\%=$
$\dfrac{1}{8}+\dfrac{5}{9}=$
$65\%-0.35=$
0.3
$5.84+4.38=$10.22
$4.5÷30=$0.15
$31.8÷1000=$
0.0318
$\dfrac{3}{2}-\dfrac{1}{5}=$$\dfrac{13}{10}$
$0.45×80=$36
$0.44÷2.2=$
0.2
$4.48+3.52=$8
$\dfrac{1}{2}+\dfrac{5}{16}=$$\dfrac{13}{16}$
$5.6-1.8=$
3.8
$124×0.5=$62
$\dfrac{7}{3}÷\dfrac{3}{5}=$$\dfrac{35}{9}$
$\dfrac{13}{15}÷\dfrac{13}{14}=$
$\dfrac{14}{15}$
$14.4÷2.4=$6
$0.9-45\%=$0.45
$\dfrac{3}{5}+40\%=$
1
$\dfrac{5}{12}-\dfrac{1}{18}=$$\dfrac{13}{36}$
$20×5.5=$110
$\dfrac{1}{8}+\dfrac{5}{9}=$
$\dfrac{49}{72}$
$7×6.5=$45.5
$\dfrac{3}{17}÷\dfrac{3}{4}=$$\dfrac{4}{17}$
答案
一、0.3 10.22 0.15
0.0318 $\dfrac{13}{10}$ 36
0.2 8 $\dfrac{13}{16}$
3.8 62 $\dfrac{35}{9}$
$\dfrac{14}{15}$ 6 0.45
1 $\dfrac{13}{36}$ 110
$\dfrac{49}{72}$ 45.5 $\dfrac{4}{17}$
0.0318 $\dfrac{13}{10}$ 36
0.2 8 $\dfrac{13}{16}$
3.8 62 $\dfrac{35}{9}$
$\dfrac{14}{15}$ 6 0.45
1 $\dfrac{13}{36}$ 110
$\dfrac{49}{72}$ 45.5 $\dfrac{4}{17}$
二、计算下面各题,怎样简便就怎样计算。
$\dfrac{15}{4}×0.25×\dfrac{8}{15}×4$ $\dfrac{17}{5}×10-9÷\dfrac{17}{5}$ $(\dfrac{3}{5}+\dfrac{1}{15})÷(\dfrac{3}{5}-\dfrac{1}{15})$
$17÷(16.4-9.6)-2.1$ $\dfrac{9}{20}÷[\dfrac{1}{3}×(\dfrac{6}{5}-\dfrac{7}{10})]$
$\dfrac{15}{4}×0.25×\dfrac{8}{15}×4$ $\dfrac{17}{5}×10-9÷\dfrac{17}{5}$ $(\dfrac{3}{5}+\dfrac{1}{15})÷(\dfrac{3}{5}-\dfrac{1}{15})$
$17÷(16.4-9.6)-2.1$ $\dfrac{9}{20}÷[\dfrac{1}{3}×(\dfrac{6}{5}-\dfrac{7}{10})]$
答案
二、2 $31\dfrac{6}{17}$ $\dfrac{5}{4}$
0.4 $\dfrac{27}{10}$
0.4 $\dfrac{27}{10}$
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