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一、口算。
$\frac{2}{5}×\frac{15}{19}=$
$70÷70\% =$
$6.8 - 2.94 =$
$\frac{2}{15}÷\frac{3}{5}=$
$\frac{2}{7}×\frac{9}{8}=$
$\frac{1}{2} + \frac{2}{3}=$
$125×4 =$
$\frac{2}{5}×\frac{15}{19}=$
$\frac{6}{19}$
$10 - 0.92 =$9.08
$\frac{1}{7} + \frac{3}{4}=$$\frac{25}{28}$
$70÷70\% =$
100
$\frac{3}{4}×50\% =$$\frac{3}{8}$
$18÷0.05 =$360
$6.8 - 2.94 =$
3.86
$15÷\frac{9}{10}=$$\frac{50}{3}$
$\frac{7}{10} + 20\% =$$\frac{9}{10}$
$\frac{2}{15}÷\frac{3}{5}=$
$\frac{2}{9}$
$\frac{9}{14} - \frac{3}{7}=$$\frac{3}{14}$
$138 + 199 =$337
$\frac{2}{7}×\frac{9}{8}=$
$\frac{9}{28}$
$0.36 + 0.24 =$0.6
$2.1×0.6 =$1.26
$\frac{1}{2} + \frac{2}{3}=$
$\frac{7}{6}$
$3÷\frac{31}{9}=$$\frac{27}{31}$
$2.4÷0.25 =$9.6
$125×4 =$
500
$\frac{20}{21}×\frac{3}{4}=$$\frac{5}{7}$
$4 - \frac{3}{4}=$$3\frac{1}{4}$
答案
一、$\frac{6}{19}$ 9.08 $\frac{25}{28}$
100 $\frac{3}{8}$ 360
3.86 $\frac{50}{3}$ $\frac{9}{10}$
$\frac{2}{9}$ $\frac{3}{14}$ 337
$\frac{9}{28}$ 0.6 1.26
$\frac{7}{6}$ $\frac{27}{31}$ 9.6
500 $\frac{5}{7}$ $3\frac{1}{4}$
100 $\frac{3}{8}$ 360
3.86 $\frac{50}{3}$ $\frac{9}{10}$
$\frac{2}{9}$ $\frac{3}{14}$ 337
$\frac{9}{28}$ 0.6 1.26
$\frac{7}{6}$ $\frac{27}{31}$ 9.6
500 $\frac{5}{7}$ $3\frac{1}{4}$
二、解比例。
$6:x = 3:15$ $\frac{1}{60}:\frac{1}{45} = x:8$ $\frac{1}{2}:\frac{1}{5} = \frac{1}{4}:x$
$\frac{4.2}{x} = \frac{7}{2.5}$ $x:16 = 1.8:24$ $9:\frac{1}{4} = x:0.2$
$6:x = 3:15$ $\frac{1}{60}:\frac{1}{45} = x:8$ $\frac{1}{2}:\frac{1}{5} = \frac{1}{4}:x$
$\frac{4.2}{x} = \frac{7}{2.5}$ $x:16 = 1.8:24$ $9:\frac{1}{4} = x:0.2$
答案
二、$x=30$ $x=6$ $x=\frac{1}{10}$
$x=1.5$ $x=1.2$ $x=\frac{36}{5}$
$x=1.5$ $x=1.2$ $x=\frac{36}{5}$
