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一、口算。
$0.74÷37\% =$
$365 + 435 =$
$\frac{13}{8} + 3÷8 =$
$\frac{14}{15}×\frac{5}{14} =$
$\frac{3}{8} + \frac{2}{3} =$
$20÷100÷0.1 =$
$9.85 - 1.95 =$
$35÷20 =$
$9 - \frac{1}{4} - \frac{7}{4} =$
$25×48 =$
$\frac{9}{10} - \frac{4}{7} =$
$(3 + \frac{3}{8})÷\frac{3}{8} =$
$\frac{3}{10}÷\frac{6}{5} =$
$3.14×16 =$
$\frac{7}{8} - \frac{5}{13} + \frac{1}{8} =$
$\frac{9}{35}×\frac{7}{5} =$
$\frac{4}{5} - \frac{3}{10} =$
$8÷\frac{2}{3}×50 =$
$250 - 32 =$
$\frac{2}{9}÷\frac{4}{15} =$
$2.3×12.5×0.8 =$
$0.74÷37\% =$
2
$365 + 435 =$
800
$\frac{13}{8} + 3÷8 =$
2
$\frac{14}{15}×\frac{5}{14} =$
$\frac{1}{3}$
$\frac{3}{8} + \frac{2}{3} =$
$\frac{25}{24}$
$20÷100÷0.1 =$
2
$9.85 - 1.95 =$
7.9
$35÷20 =$
1.75
$9 - \frac{1}{4} - \frac{7}{4} =$
7
$25×48 =$
1200
$\frac{9}{10} - \frac{4}{7} =$
$\frac{23}{70}$
$(3 + \frac{3}{8})÷\frac{3}{8} =$
9
$\frac{3}{10}÷\frac{6}{5} =$
$\frac{1}{4}$
$3.14×16 =$
50.24
$\frac{7}{8} - \frac{5}{13} + \frac{1}{8} =$
$\frac{8}{13}$
$\frac{9}{35}×\frac{7}{5} =$
$\frac{9}{25}$
$\frac{4}{5} - \frac{3}{10} =$
$\frac{1}{2}$
$8÷\frac{2}{3}×50 =$
600
$250 - 32 =$
218
$\frac{2}{9}÷\frac{4}{15} =$
$\frac{5}{6}$
$2.3×12.5×0.8 =$
23
答案
一、2 800 2
$\frac{1}{3} \frac{25}{24} 2$
7.9 1.75 7
$1200 \frac{23}{70} 9$
$\frac{1}{4} 50.24 \frac{8}{13}$
$\frac{9}{25} \frac{1}{2} 600$
$218 \frac{5}{6} 23$
$\frac{1}{3} \frac{25}{24} 2$
7.9 1.75 7
$1200 \frac{23}{70} 9$
$\frac{1}{4} 50.24 \frac{8}{13}$
$\frac{9}{25} \frac{1}{2} 600$
$218 \frac{5}{6} 23$
二、计算下面各图形的表面积和体积。
答案
二、表面积：(6×5+6×4+5×4)×2=148(cm²)
体积：6×5×4−4×4×4=56(cm³)
表面积：3.14×4×4+4×2−3.14×4×2÷2+3.14×(4÷2)²×2=70.8(cm²)
体积：3.14×(4÷2)²×4−3.14×(4÷2)²×2÷2=37.68(cm³)
体积：6×5×4−4×4×4=56(cm³)
表面积：3.14×4×4+4×2−3.14×4×2÷2+3.14×(4÷2)²×2=70.8(cm²)
体积：3.14×(4÷2)²×4−3.14×(4÷2)²×2÷2=37.68(cm³)
