《2025年通城学典计算能手五年级数学下册青岛版五四制》

一、口算。
$2.05 \times 3 =$ $1.6 - 0.05 =$ $12.5 \div 2.5 =$
$180 \div 5 =$ $\frac{4}{7} \times \frac{11}{12} =$ $\frac{6}{5} - \frac{5}{6} =$
$16.8 \div 8 =$ $18 \div \frac{4}{9} =$ $\frac{3}{4} + 50\% =$
$62.5\% \div \frac{4}{5} =$ $\frac{5}{4} - \frac{8}{15} =$ $3.6 \times 10\% =$
$2.17 + 3.33 =$ $\frac{34}{39} \div \frac{17}{13} =$ $7.6 - 2.89 =$
$210 - 170 =$ $0.76 + 3.34 =$ $1.85 \times 0.4 =$
$458 + 342 =$ $\frac{6}{7} \times \frac{7}{78} =$ $4.5 \div 1.8 =$
$2.5 - 0.7 =$ $\frac{3}{14} + \frac{6}{7} =$ $20 \div 20\% =$
$160 \div 200 =$ $3 \div 0.03 =$ $\frac{3}{22} \div \frac{9}{11} =$
$20\% \times \frac{3}{4} =$ $35\% \times 20\% =$ $7.4 - 6.85 =$

答案： 6.15@@1.55@@5@@36@@$\frac{11}{21}$@@$\frac{11}{30}$@@2.1@@$\frac{81}{2}$@@$\frac{5}{4}$@@$\frac{25}{32}$@@$\frac{43}{60}$@@0.36@@5.5@@$\frac{2}{3}$@@4.71@@40@@4.1@@0.74@@800@@$\frac{1}{13}$@@2.5@@1.8@@$\frac{15}{14}$@@100@@0.8@@100@@$\frac{1}{6}$@@$\frac{3}{20}$@@0.07@@0.55

二、计算下面各题，怎样简便就怎样计算。
$2.6 + 15.45 + 4.55 + 7.4$ $2 \div 50\% - 20\% \times 45\%$ $38 \div [\frac{1}{3} + (\frac{5}{8} - \frac{1}{6})]$

答案： 30@@3.91@@48