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1. 在括号里填上合适的数。
$12÷($
$12÷($
10
)=6÷5=$\frac {（）}{25}$=(120
$)\% =($1.2
$)$(小数)
答案：
1.10 30 120 1.2
2. 在$◯$里填上“＞”“＜”或“=”。
$\frac {5}{6}×\frac {2}{7}◯ \frac {5}{6}$ $\frac {2}{9}÷\frac {3}{4}◯ \frac {2}{9}$ $\frac {3}{5}÷\frac {5}{8}◯ \frac {9}{15}÷\frac {10}{16}$
$\frac {5}{6}×\frac {2}{7}◯ \frac {5}{6}$ $\frac {2}{9}÷\frac {3}{4}◯ \frac {2}{9}$ $\frac {3}{5}÷\frac {5}{8}◯ \frac {9}{15}÷\frac {10}{16}$
答案：
2. ＜ ＞ =
3. 直接写出得数。
$\frac {2}{3}×6=$ $4.2÷10\% =$ $25\% +1\frac {3}{8}=$ $3.5×\frac {3}{5}-0.6×3.5=$
$\frac {4}{7}÷\frac {8}{21}=$ $5.1÷1\frac {7}{10}=$ $4-\frac {1}{5}+\frac {4}{5}=$ $\frac {10}{13}×\frac {3}{8}×\frac {13}{10}=$
$1÷25\% =$ $0.28×\frac {1}{84}=$ $50\% +\frac {1}{8}=$ $\frac {1}{8}÷3+\frac {7}{8}÷3=$
$\frac {2}{3}×6=$ $4.2÷10\% =$ $25\% +1\frac {3}{8}=$ $3.5×\frac {3}{5}-0.6×3.5=$
$\frac {4}{7}÷\frac {8}{21}=$ $5.1÷1\frac {7}{10}=$ $4-\frac {1}{5}+\frac {4}{5}=$ $\frac {10}{13}×\frac {3}{8}×\frac {13}{10}=$
$1÷25\% =$ $0.28×\frac {1}{84}=$ $50\% +\frac {1}{8}=$ $\frac {1}{8}÷3+\frac {7}{8}÷3=$
答案：
3.4 42 $\frac{13}{8}$ 0 $\frac{3}{2}$ 3 $\frac{23}{5}$ $\frac{3}{8}$ 4 $\frac{1}{300}$ $\frac{5}{8}$
4. 下列各题能简算的要简算。
$\frac {3}{4}×\frac {2}{5}÷\frac {11}{20}$ $3.9×\frac {6}{5}+1.1÷\frac {5}{6}$ $\frac {9}{16}÷(\frac {9}{16}+\frac {9}{32})$
$10.5÷1.25÷\frac {4}{5}÷\frac {1}{10}$ $17×(\frac {3}{4}-\frac {11}{17})×4$ $\frac {2}{3}×[\frac {13}{24}÷(\frac {1}{3}-\frac {1}{4})]$
$\frac {3}{4}×\frac {2}{5}÷\frac {11}{20}$ $3.9×\frac {6}{5}+1.1÷\frac {5}{6}$ $\frac {9}{16}÷(\frac {9}{16}+\frac {9}{32})$
$10.5÷1.25÷\frac {4}{5}÷\frac {1}{10}$ $17×(\frac {3}{4}-\frac {11}{17})×4$ $\frac {2}{3}×[\frac {13}{24}÷(\frac {1}{3}-\frac {1}{4})]$
答案：
4.$\frac{1}{3}$ $\frac{6}{11}$ 6 $\frac{2}{3}$ 105 7 $\frac{13}{3}$
5. 解方程。
$25\% x=\frac {5}{16}$ $0.6:x=0.9:\frac {5}{9}$ $\frac {1}{2}(x-2.2)=2\frac {2}{5}$
$25\% x=\frac {5}{16}$ $0.6:x=0.9:\frac {5}{9}$ $\frac {1}{2}(x-2.2)=2\frac {2}{5}$
答案：
5.$x=\frac{5}{4}$ $x=\frac{10}{27}$ $x=7$
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