一、直接写出得数。(共32分)
$569 - 47 =$
$143 + 27 =$
$1.5 : 0.4 =$
$1.6 × 9 + 1.6 =$
$0.06 × 0.5 =$
$100 × 0.15 =$
$120 : 340 =$
$0.8 + 0.8 ÷ 0.02 =$
$4.8 + 0.6 =$
$1.5 × 0.6 =$
$3.2 : 0.05 =$
$7 - 4.3 - 1.7 =$
$2 - 1.22 =$
$3.15 ÷ 0.5 =$
$215 : 50 =$
$7.07 ÷ (2.5 × 0.4) =$
$\frac{5}{7} × \frac{2}{5} =$
$9 ÷ \frac{3}{14} =$
$\frac{5}{8} : \frac{15}{8} =$
$\frac{5}{7} ÷ (1 - \frac{5}{7}) =$
$\frac{5}{13} × 39 =$
$\frac{7}{10} × \frac{15}{28} =$
$9 : \frac{3}{8} =$
$2.4 × (\frac{1}{8} + \frac{11}{12}) =$
$\frac{5}{6} ÷ \frac{10}{3} =$
$\frac{20}{39} ÷ 5 =$
$\frac{5}{6} : \frac{2}{7} =$
$13 - 14 × \frac{4}{7} =$
$\frac{4}{11} ÷ \frac{8}{11} =$
$\frac{2}{9} × \frac{3}{7} =$
$\frac{13}{20} : 0.6 =$
$2 - \frac{13}{27} ÷ \frac{13}{36} =$
$569 - 47 =$
$143 + 27 =$
$1.5 : 0.4 =$
$1.6 × 9 + 1.6 =$
$0.06 × 0.5 =$
$100 × 0.15 =$
$120 : 340 =$
$0.8 + 0.8 ÷ 0.02 =$
$4.8 + 0.6 =$
$1.5 × 0.6 =$
$3.2 : 0.05 =$
$7 - 4.3 - 1.7 =$
$2 - 1.22 =$
$3.15 ÷ 0.5 =$
$215 : 50 =$
$7.07 ÷ (2.5 × 0.4) =$
$\frac{5}{7} × \frac{2}{5} =$
$9 ÷ \frac{3}{14} =$
$\frac{5}{8} : \frac{15}{8} =$
$\frac{5}{7} ÷ (1 - \frac{5}{7}) =$
$\frac{5}{13} × 39 =$
$\frac{7}{10} × \frac{15}{28} =$
$9 : \frac{3}{8} =$
$2.4 × (\frac{1}{8} + \frac{11}{12}) =$
$\frac{5}{6} ÷ \frac{10}{3} =$
$\frac{20}{39} ÷ 5 =$
$\frac{5}{6} : \frac{2}{7} =$
$13 - 14 × \frac{4}{7} =$
$\frac{4}{11} ÷ \frac{8}{11} =$
$\frac{2}{9} × \frac{3}{7} =$
$\frac{13}{20} : 0.6 =$
$2 - \frac{13}{27} ÷ \frac{13}{36} =$
答案
522、170、3.75、16、0.03、15、$\frac{6}{17}$、40.8、5.4、0.9、64、1、0.78、6.3、4.3、7.07、$\frac{2}{7}$、42、$\frac{1}{3}$、$\frac{5}{2}$、15、$\frac{3}{8}$、24、2.5、$\frac{1}{4}$、$\frac{4}{39}$、$\frac{35}{12}$、5、$\frac{1}{2}$、$\frac{2}{21}$、$\frac{13}{12}$、$\frac{2}{3}$
二、用竖式计算,带☆的要验算。(共20分)
0.78×0.35= ☆3.264÷0.32= 0.52×0.63≈
(得数保留两位小数)
54÷1.2= ☆3.08×0.43= 9.375÷2.4≈
(得数保留一位小数)
0.78×0.35= ☆3.264÷0.32= 0.52×0.63≈
(得数保留两位小数)
54÷1.2= ☆3.08×0.43= 9.375÷2.4≈
(得数保留一位小数)
答案
0.273、10.2、0.33、45、1.3244、3.9
竖式及验算略
竖式及验算略
三、计算下面各题,怎样算简便就怎样算。(共24分)
$9.9÷ \dfrac{3}{4}× \dfrac{1}{4}$
$4.5× 1.2 - 3.15÷ 15$
$4.2÷ [(1.5 + 12.5)÷ 28]$
$3 - \dfrac{10}{21}× \dfrac{3}{2} - \dfrac{2}{7}$
$(\dfrac{3}{7} - \dfrac{1}{34})× 7 - \dfrac{27}{34}$
$37÷ [(0.5 + 0.4)× \dfrac{5}{9}]$
$9.9÷ \dfrac{3}{4}× \dfrac{1}{4}$
$4.5× 1.2 - 3.15÷ 15$
$4.2÷ [(1.5 + 12.5)÷ 28]$
$3 - \dfrac{10}{21}× \dfrac{3}{2} - \dfrac{2}{7}$
$(\dfrac{3}{7} - \dfrac{1}{34})× 7 - \dfrac{27}{34}$
$37÷ [(0.5 + 0.4)× \dfrac{5}{9}]$
答案
3.3、5.19、8.4、2、2、74
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