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1. 在括号里填上合适的数。
$42÷($
$42÷($
48
)=0.875=$\frac {（）}{( )}$=(56
$):64=($87.5
$)\%$
答案：
1.$48\frac{7}{8}$ $56$ $87.5$
2. 算一算。
50 kg 的 30%是(
50 kg 的 30%是(
15
)kg 120 m 比(180
)m 少$\frac {1}{3}$ (36.2
)t 比 36 t 多$\frac {1}{5}t$
答案：
2.$15$ $180$ $36.2$
3. 直接写出得数。
$\frac {7}{16}×2=$ $\frac {1}{4}-\frac {1}{5}=$ $\frac {5}{4}÷\frac {15}{16}=$ $3.14×(5^{2}-4^{2})=$
$\frac {3}{4}+12.5\% =$ $0.25÷\frac {1}{8}=$ $\frac {3}{17}+\frac {14}{17}×0=$ $\frac {5}{13}×1.25×26×0.8=$
$20÷75\% =$ $\frac {3}{8}×\frac {4}{21}=$ $1÷\frac {a}{b}=$ $\frac {1}{4}×\frac {1}{3}÷\frac {1}{4}×\frac {1}{3}=$
$\frac {7}{16}×2=$ $\frac {1}{4}-\frac {1}{5}=$ $\frac {5}{4}÷\frac {15}{16}=$ $3.14×(5^{2}-4^{2})=$
$\frac {3}{4}+12.5\% =$ $0.25÷\frac {1}{8}=$ $\frac {3}{17}+\frac {14}{17}×0=$ $\frac {5}{13}×1.25×26×0.8=$
$20÷75\% =$ $\frac {3}{8}×\frac {4}{21}=$ $1÷\frac {a}{b}=$ $\frac {1}{4}×\frac {1}{3}÷\frac {1}{4}×\frac {1}{3}=$
答案：
3.$\frac{7}{8}$ $\frac{1}{20}$ $\frac{4}{3}$ $28.26$ $\frac{7}{8}$ $2\frac{3}{17}$ $10\frac{80}{3}$ $\frac{1}{14}$ $\frac{b}{a}$ $\frac{1}{9}$
4. 递等式计算,能简算的要简算。
$24×(\frac {5}{12}-\frac {3}{8}+\frac {1}{6})$ $\frac {5}{9}×\frac {4}{7}÷\frac {10}{21}$ $\frac {2017}{2018}×2019$
$\frac {3}{16}÷\frac {5}{7}+\frac {7}{5}×\frac {13}{16}$ $\frac {1}{3}+(0.75+0.25÷\frac {3}{8})$ $\frac {4}{5}÷[(\frac {1}{4}+\frac {2}{7})×\frac {4}{15}]$
$24×(\frac {5}{12}-\frac {3}{8}+\frac {1}{6})$ $\frac {5}{9}×\frac {4}{7}÷\frac {10}{21}$ $\frac {2017}{2018}×2019$
$\frac {3}{16}÷\frac {5}{7}+\frac {7}{5}×\frac {13}{16}$ $\frac {1}{3}+(0.75+0.25÷\frac {3}{8})$ $\frac {4}{5}÷[(\frac {1}{4}+\frac {2}{7})×\frac {4}{15}]$
答案：
4.$5\frac{2}{3}$ $2017\frac{2017}{2018}$ $1\frac{7}{5}$ $\frac{7}{4}$ $\frac{28}{5}$
5. 解方程。
$\frac {3}{7}x-24=360$ $\frac {2}{3}x+50\% x=42$ $\frac {5}{6}(x-4.5)=\frac {7}{12}$
$\frac {3}{7}x-24=360$ $\frac {2}{3}x+50\% x=42$ $\frac {5}{6}(x-4.5)=\frac {7}{12}$
答案：
5.$x=896$ $x=36$ $x=\frac{26}{5}$
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