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一、口算。
$2.5×0.04=$
$\frac{1}{4}÷\frac{2}{5}=$
$9.1-0.08=$
$125×\frac{3}{5}=$
$1.5-39\%=$
$\frac{7}{8}÷\frac{7}{10}=$
$\frac{1}{9}+\frac{1}{18}=$
$2.5×0.04=$
0.1
$\frac{2}{3}-\frac{2}{5}=$$\dfrac{4}{15}$
$0.125÷2.5=$0.05
$\frac{1}{4}÷\frac{2}{5}=$
$\dfrac{5}{8}$
$0.22×4=$0.88
$4.8×\frac{5}{6}=$4
$9.1-0.08=$
9.02
$\frac{4}{5}×\frac{5}{8}=$$\dfrac{1}{2}$
$2-\frac{8}{5}=$$\dfrac{2}{5}$
$125×\frac{3}{5}=$
75
$5.8+4.2=$10
$5.5÷11=$0.5
$1.5-39\%=$
1.11
$0.4÷4\%=$10
$\frac{4}{3}÷\frac{5}{6}=$$\dfrac{8}{5}$
$\frac{7}{8}÷\frac{7}{10}=$
$\dfrac{5}{4}$
$730-180=$550
$\frac{15}{29}+\frac{18}{29}=$$\dfrac{33}{29}$
$\frac{1}{9}+\frac{1}{18}=$
$\dfrac{1}{6}$
$10-\frac{9}{11}=$$9\dfrac{2}{11}$
$3+10\%=$3.1
答案
一、$0.1$ $\dfrac{4}{15}$ $0.05$
$\dfrac{5}{8}$ $0.88$ $4$
$9.02$ $\dfrac{1}{2}$ $\dfrac{2}{5}$
$75$ $10$ $0.5$
$1.11$ $10$ $\dfrac{8}{5}$
$\dfrac{5}{4}$ $550$ $\dfrac{33}{29}$
$\dfrac{1}{6}$ $9\dfrac{2}{11}$ $3.1$
$\dfrac{5}{8}$ $0.88$ $4$
$9.02$ $\dfrac{1}{2}$ $\dfrac{2}{5}$
$75$ $10$ $0.5$
$1.11$ $10$ $\dfrac{8}{5}$
$\dfrac{5}{4}$ $550$ $\dfrac{33}{29}$
$\dfrac{1}{6}$ $9\dfrac{2}{11}$ $3.1$
二、计算下面各题，怎样简便就怎样计算。
$4.3×50×0.02$ $3÷50\%-25\%×30\%$ $18÷[\frac{5}{6}+(\frac{5}{8}-\frac{1}{3})]$
$(\frac{3}{7}+\frac{4}{17})×7+\frac{23}{17}$ $0.99×99+99\%$ $8.25÷(3.2+2.3)×1.6$
$4.3×50×0.02$ $3÷50\%-25\%×30\%$ $18÷[\frac{5}{6}+(\frac{5}{8}-\frac{1}{3})]$
$(\frac{3}{7}+\frac{4}{17})×7+\frac{23}{17}$ $0.99×99+99\%$ $8.25÷(3.2+2.3)×1.6$
答案
二、$4.3$ $5\dfrac{37}{40}$ $16$
$6$ $99$ $2.4$
$6$ $99$ $2.4$
