1. 口算。
$\frac{7}{12}-\frac{1}{12}=$
$\frac{7}{6}-\frac{5}{8}=$
$\frac{5}{2}+\frac{2}{5}=$
$1-\frac{11}{12}-\frac{1}{12}=$
$\frac{7}{12}-\frac{1}{12}=$
$\frac{1}{2}$
$\frac{3}{8}+\frac{7}{8}=$$\frac{5}{4}$
$1-\frac{4}{9}=$$\frac{5}{9}$
$\frac{3}{11}+\frac{5}{11}=$$\frac{8}{11}$
$\frac{7}{6}-\frac{5}{8}=$
$\frac{13}{24}$
$\frac{1}{3}-\frac{1}{5}=$$\frac{2}{15}$
$\frac{8}{9}-\frac{4}{27}=$$\frac{20}{27}$
$3-2\frac{1}{12}=$$\frac{11}{12}$
$\frac{5}{2}+\frac{2}{5}=$
$\frac{29}{10}$
$\frac{1}{3}+1\frac{2}{3}=$2
$5-2\frac{1}{6}=$$2\frac{5}{6}$
$\frac{5}{9}-\frac{1}{3}=$$\frac{2}{9}$
$1-\frac{11}{12}-\frac{1}{12}=$
0
$\frac{3}{4}+\frac{5}{9}-\frac{3}{4}=$$\frac{5}{9}$
$\frac{3}{8}-\frac{1}{5}+\frac{8}{8}=$$\frac{3}{10}$
答案:
$\frac{1}{2}$ $\frac{5}{4}$ $\frac{5}{9}$ $\frac{8}{11}$ $\frac{13}{24}$ $\frac{2}{15}$ $\frac{20}{27}$ $\frac{11}{12}$ $\frac{29}{10}$ 2 $2\frac{5}{6}$ $\frac{2}{9}$ 0 $\frac{5}{9}$ $\frac{3}{10}$
2. 计算下面各题,能简算的要简算。
$\frac{1}{5}+(\frac{4}{5}-\frac{2}{3})$ $\frac{16}{17}-\frac{9}{5}+\frac{4}{5}+\frac{18}{17}$ $1-\frac{1}{6}-\frac{1}{12}-\frac{1}{20}$
$\frac{7}{9}-\frac{1}{27}+\frac{1}{54}$ $\frac{11}{5}-(\frac{1}{5}+\frac{1}{9})$ $\frac{4}{7}+\frac{7}{8}-\frac{3}{7}+\frac{1}{8}$
$\frac{1}{5}+(\frac{4}{5}-\frac{2}{3})$ $\frac{16}{17}-\frac{9}{5}+\frac{4}{5}+\frac{18}{17}$ $1-\frac{1}{6}-\frac{1}{12}-\frac{1}{20}$
$\frac{7}{9}-\frac{1}{27}+\frac{1}{54}$ $\frac{11}{5}-(\frac{1}{5}+\frac{1}{9})$ $\frac{4}{7}+\frac{7}{8}-\frac{3}{7}+\frac{1}{8}$
答案:
$\frac{1}{3}$ 1 $\frac{7}{10}$ $\frac{41}{54}$ $1\frac{8}{9}$ $1\frac{1}{7}$
3. 解方程。
$x-\frac{5}{8}-\frac{1}{3}= \frac{5}{6}$
$\frac{3}{4}+\frac{5}{6}-x= \frac{5}{8}$
$x-(\frac{2}{5}+\frac{3}{10})= \frac{19}{30}$
$x-\frac{5}{8}-\frac{1}{3}= \frac{5}{6}$
$\frac{43}{24}$
$\frac{3}{4}+\frac{5}{6}-x= \frac{5}{8}$
$\frac{23}{24}$
$x-(\frac{2}{5}+\frac{3}{10})= \frac{19}{30}$
$\frac{4}{3}$
答案:
$x=\frac{43}{24}$ $x=\frac{23}{24}$ $x=\frac{4}{3}$
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