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一、口算。
$1000 - 398 =$
$\frac{2}{3} × \frac{33}{34} =$
$2.93 + 13.07 =$
$0.3 × 3.14 =$
$1.76 + 2.24 =$
$25\% × 4 =$
$\frac{1}{5} ÷ \frac{3}{5} =$
$1000 - 398 =$
602
$28 ÷ 35 =$0.8
$0.14 ÷ 0.7 =$0.2
$\frac{2}{3} × \frac{33}{34} =$
$\dfrac{11}{17}$
$0.13 × 8 =$1.04
$9 ÷ 3\% =$300
$2.93 + 13.07 =$
16
$\frac{5}{8} × \frac{12}{25} =$$\dfrac{3}{10}$
$\frac{3}{8} ÷ \frac{9}{4} =$$\dfrac{1}{6}$
$0.3 × 3.14 =$
0.942
$1.2 - 105\% =$0.15
$\frac{5}{14} + \frac{5}{7} =$$\dfrac{15}{14}$
$1.76 + 2.24 =$
4
$\frac{17}{18} + \frac{5}{9} =$$\dfrac{3}{2}$
$\frac{5}{9} ÷ \frac{5}{24} =$$\dfrac{8}{3}$
$25\% × 4 =$
1
$\frac{8}{5} ÷ \frac{6}{25} =$$\dfrac{20}{3}$
$\frac{7}{8} - \frac{2}{3} =$$\dfrac{5}{24}$
$\frac{1}{5} ÷ \frac{3}{5} =$
$\dfrac{1}{3}$
$1.79 - 0.9 =$0.89
$\frac{1}{7} × \frac{7}{9} =$$\dfrac{1}{9}$
答案
602 0.8 0.2
$\dfrac{11}{17}$ 1.04 300
16 $\dfrac{3}{10}$ $\dfrac{1}{6}$
0.942 0.15 $\dfrac{15}{14}$
4 $\dfrac{3}{2}$ $\dfrac{8}{3}$
1 $\dfrac{20}{3}$ $\dfrac{5}{24}$
$\dfrac{1}{3}$ 0.89 $\dfrac{1}{9}$
$\dfrac{11}{17}$ 1.04 300
16 $\dfrac{3}{10}$ $\dfrac{1}{6}$
0.942 0.15 $\dfrac{15}{14}$
4 $\dfrac{3}{2}$ $\dfrac{8}{3}$
1 $\dfrac{20}{3}$ $\dfrac{5}{24}$
$\dfrac{1}{3}$ 0.89 $\dfrac{1}{9}$
二、解方程或比例。
$\frac{3}{8} : \frac{2}{5} = 0.5 : x$ $\frac{2}{3}x - 4 × 25\% = \frac{3}{7}$ $\frac{5}{7}x - \frac{3}{5}x = \frac{2}{5}$
$\frac{2x}{9} = \frac{4}{5}$ $2.5x + 0.5 × 6 = 6.5$ $60 : x = 5 : \frac{2}{3}$
$\frac{3}{8} : \frac{2}{5} = 0.5 : x$ $\frac{2}{3}x - 4 × 25\% = \frac{3}{7}$ $\frac{5}{7}x - \frac{3}{5}x = \frac{2}{5}$
$\frac{2x}{9} = \frac{4}{5}$ $2.5x + 0.5 × 6 = 6.5$ $60 : x = 5 : \frac{2}{3}$
答案
$x=\dfrac{8}{15}$ $x=\dfrac{15}{7}$ $x=\dfrac{7}{2}$
$x=\dfrac{18}{5}$ $x=\dfrac{7}{5}$ $x=8$
$x=\dfrac{18}{5}$ $x=\dfrac{7}{5}$ $x=8$
