登录
1. 直接写出得数。
$3.2 + 6.1 =$ $3.15 + 1.6 =$ $4.6 - 0.56 =$
$6 - 3\frac{1}{2} =$ $\frac{5}{12} + \frac{1}{6} =$ $\frac{1}{5} - \frac{3}{20} =$
$\frac{3}{5} + 0.15 =$ $0.375 - \frac{1}{8} =$ $\frac{2}{5} + \frac{7}{10} =$
$3.2 + 6.1 =$ $3.15 + 1.6 =$ $4.6 - 0.56 =$
$6 - 3\frac{1}{2} =$ $\frac{5}{12} + \frac{1}{6} =$ $\frac{1}{5} - \frac{3}{20} =$
$\frac{3}{5} + 0.15 =$ $0.375 - \frac{1}{8} =$ $\frac{2}{5} + \frac{7}{10} =$
答案
2. 下列各题做得对吗？错的在$\bigcirc$里打“×”，并改正过来。
$35.2 + 2.74 = 62.6$ $\bigcirc$ $32.1 - 1.56 = 30.66$ $\bigcirc$
$\frac{3}{4} + \frac{4}{5} = \frac{7}{20}$ $\bigcirc$ $\frac{5}{6} - \frac{4}{7} = \frac{1}{6}$ $\bigcirc$
我来改正
$35.2 + 2.74 = 62.6$ $\bigcirc$ $32.1 - 1.56 = 30.66$ $\bigcirc$
$\frac{3}{4} + \frac{4}{5} = \frac{7}{20}$ $\bigcirc$ $\frac{5}{6} - \frac{4}{7} = \frac{1}{6}$ $\bigcirc$
我来改正
答案
3. 用简便方法计算。
$34.82 -(6.25 + 14.82)$ $7.8 + 0.2 - 7.8 + 0.2$ $7.15 -(0.15 - 0.08)$
$5.3 - 1.46 - 0.54$ $\frac{11}{12} - (\frac{1}{3} + \frac{5}{12})$ $\frac{7}{8} + (\frac{3}{4} - \frac{1}{8})$
$34.82 -(6.25 + 14.82)$ $7.8 + 0.2 - 7.8 + 0.2$ $7.15 -(0.15 - 0.08)$
$5.3 - 1.46 - 0.54$ $\frac{11}{12} - (\frac{1}{3} + \frac{5}{12})$ $\frac{7}{8} + (\frac{3}{4} - \frac{1}{8})$
答案
4. 比比谁算得又快又对。
$18.3 - 9.928 + 21.7 - 3.072$ $7.2 - (0.35 + 2.2)$
$5.48 - (6\frac{3}{5} - 2.35) - \frac{1}{4}$ $19\frac{7}{18} - (9\frac{7}{18} - \frac{5}{6}) + \frac{1}{6}$
$18.3 - 9.928 + 21.7 - 3.072$ $7.2 - (0.35 + 2.2)$
$5.48 - (6\frac{3}{5} - 2.35) - \frac{1}{4}$ $19\frac{7}{18} - (9\frac{7}{18} - \frac{5}{6}) + \frac{1}{6}$
答案
