$\frac{14}{15} × \frac{5}{7} =$
$(18 ÷ 2)^2 =$
$3.14 × (2^2 - 1^2) =$
$1 ÷ \frac{2}{3} =$
$(30 ÷ 2)^2 =$
$3.14 × (0.2 ÷ 2)^2 =$
$2.5 × \frac{3}{5} =$
$(0.4 ÷ 2)^2 =$
$3.14 × (4 ÷ 2)^2 =$
$\frac{13}{51} ÷ \frac{13}{17} =$
$(10 ÷ 2)^2 =$
$3.14 × (4^2 - 3^2) =$
$(18 ÷ 2)^2 =$
$3.14 × (2^2 - 1^2) =$
$1 ÷ \frac{2}{3} =$
$(30 ÷ 2)^2 =$
$3.14 × (0.2 ÷ 2)^2 =$
$2.5 × \frac{3}{5} =$
$(0.4 ÷ 2)^2 =$
$3.14 × (4 ÷ 2)^2 =$
$\frac{13}{51} ÷ \frac{13}{17} =$
$(10 ÷ 2)^2 =$
$3.14 × (4^2 - 3^2) =$
答案
1. $\frac{2}{3}$
2. 81
3. 9.42
4. $\frac{3}{2}$
5. 225
6. 0.0314
7. 1.5
8. 0.04
9. 12.56
10. $\frac{1}{3}$
11. 25
12. 21.98
2. 81
3. 9.42
4. $\frac{3}{2}$
5. 225
6. 0.0314
7. 1.5
8. 0.04
9. 12.56
10. $\frac{1}{3}$
11. 25
12. 21.98
2 图形计算(求下面各图形中涂色部分的面积) 建议用时3分钟 评价:☆☆☆
(1)
(2)
(3)
(1)
(2)
(3)
答案
(1) $3.14×10^2-3.14×6^2=200.96(cm^2)$
(2) $3.14×10^2-3.14×(10÷2)^2=235.5(dm^2)$
(3) $20×16-3.14×(16÷2)^2=119.04(cm^2)$
(2) $3.14×10^2-3.14×(10÷2)^2=235.5(dm^2)$
(3) $20×16-3.14×(16÷2)^2=119.04(cm^2)$
3 脱式计算(能简算的要简算) 建议用时4分钟 评价:☆☆☆
$\frac{5}{13} × \frac{7}{8} × \frac{26}{5}$
$\frac{2}{9} ÷ \frac{16}{7} × \frac{3}{14}$
$\frac{3}{4} × 7 + \frac{1}{4} × 7$
$24 × ( \frac{1}{3} + \frac{1}{12} - \frac{1}{6} )$
$20 ÷ ( \frac{16}{3} × \frac{9}{4} + \frac{1}{3} )$
$\frac{8}{15} × [ \frac{5}{6} ÷ ( \frac{7}{9} - \frac{1}{3} ) ]$
$\frac{5}{13} × \frac{7}{8} × \frac{26}{5}$
$\frac{2}{9} ÷ \frac{16}{7} × \frac{3}{14}$
$\frac{3}{4} × 7 + \frac{1}{4} × 7$
$24 × ( \frac{1}{3} + \frac{1}{12} - \frac{1}{6} )$
$20 ÷ ( \frac{16}{3} × \frac{9}{4} + \frac{1}{3} )$
$\frac{8}{15} × [ \frac{5}{6} ÷ ( \frac{7}{9} - \frac{1}{3} ) ]$
答案
1. $\frac{7}{4}$
2. $\frac{1}{48}$
3. 7
4. 6
5. $\frac{60}{37}$
6. 1
2. $\frac{1}{48}$
3. 7
4. 6
5. $\frac{60}{37}$
6. 1
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