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一、口算。
$ \frac{1}{4} ÷ \frac{1}{9} = $
$ \frac{7}{12} + \frac{2}{3} = $
$ 18.84 + 1.16 = $
$ \frac{1}{2} × \frac{3}{10} = $
$ 1.77 + 1.46 = $
$ \frac{2}{15} + \frac{3}{5} = $
$ \frac{5}{6} ÷ \frac{1}{15} = $
$ \frac{1}{4} ÷ \frac{1}{9} = $
$\dfrac{9}{4}$
$ \frac{2}{3} - \frac{1}{5} = $$\dfrac{7}{15}$
$ 75\% × \frac{1}{5} = $$\dfrac{3}{20}$
$ \frac{7}{12} + \frac{2}{3} = $
$\dfrac{5}{4}$
$ 2.05 × 40 = $82
$ 57.5 ÷ 2.5 = $23
$ 18.84 + 1.16 = $
20
$ \frac{3}{2} × \frac{8}{21} = $$\dfrac{4}{7}$
$ \frac{7}{20} ÷ \frac{7}{10} = $$\dfrac{1}{2}$
$ \frac{1}{2} × \frac{3}{10} = $
$\dfrac{3}{20}$
$ 5.32 ÷ 0.4 = $13.3
$ 459 + 98 = $557
$ 1.77 + 1.46 = $
3.23
$ 1.1 - 0.75 = $0.35
$ \frac{5}{8} ÷ \frac{5}{14} = $$\dfrac{7}{4}$
$ \frac{2}{15} + \frac{3}{5} = $
$\dfrac{11}{15}$
$ 46 ÷ 10\% = $460
$ 50 × 30\% = $15
$ \frac{5}{6} ÷ \frac{1}{15} = $
$\dfrac{25}{2}$
$ 2 - \frac{1}{3} = $$1\dfrac{2}{3}$
$ 0.25 × 400 = $100
答案
一、$\dfrac{9}{4}$ $\dfrac{7}{15}$ $\dfrac{3}{20}$
$\dfrac{5}{4}$ 82 23
20 $\dfrac{4}{7}$ $\dfrac{1}{2}$
$\dfrac{3}{20}$ 13.3 557
3.23 0.35 $\dfrac{7}{4}$
$\dfrac{11}{15}$ 460 15
$\dfrac{25}{2}$ $1\dfrac{2}{3}$ 100
$\dfrac{5}{4}$ 82 23
20 $\dfrac{4}{7}$ $\dfrac{1}{2}$
$\dfrac{3}{20}$ 13.3 557
3.23 0.35 $\dfrac{7}{4}$
$\dfrac{11}{15}$ 460 15
$\dfrac{25}{2}$ $1\dfrac{2}{3}$ 100
二、解比例。
$ \frac{36}{x} = \frac{3}{4} $$ $$ x : 36 = 6 : 18 $$ $$ \frac{2}{3} : x = \frac{1}{4} : \frac{5}{8} $
$ 1.2 : 5 = 36 : x $$ $$ \frac{1.25}{4} = 0.375 : x $$ $$ \frac{7}{36} : x = \frac{1}{5} : \frac{54}{7} $
$ \frac{36}{x} = \frac{3}{4} $$ $$ x : 36 = 6 : 18 $$ $$ \frac{2}{3} : x = \frac{1}{4} : \frac{5}{8} $
$ 1.2 : 5 = 36 : x $$ $$ \frac{1.25}{4} = 0.375 : x $$ $$ \frac{7}{36} : x = \frac{1}{5} : \frac{54}{7} $
答案
二、$x=48$ $x=12$ $x=\dfrac{5}{3}$
$x=150$ $x=1.2$ $x=\dfrac{15}{2}$
$x=150$ $x=1.2$ $x=\dfrac{15}{2}$
