1. 在括号里填上合适的数。
$4.5÷($$)÷28=($
$4.5÷($
6
)=$\frac {9}{( )}$=75% =(21
3
$):($4
$)$(最简整数比)
答案:
1. 6 12 21 3 4
2. 在$◯$里填上“$>$”“$<$”或“$=$”。
$3.14×\frac {7}{8}◯ π$ $\frac {3}{4}÷\frac {2017}{2018}◯ \frac {3}{4}$ $\frac {1}{2}+\frac {1}{4}+\frac {1}{8}+\frac {1}{16}+... ◯ 1$
$3.14×\frac {7}{8}◯ π$ $\frac {3}{4}÷\frac {2017}{2018}◯ \frac {3}{4}$ $\frac {1}{2}+\frac {1}{4}+\frac {1}{8}+\frac {1}{16}+... ◯ 1$
答案:
2. < > <
3. 直接写出得数。
$3×\frac {1}{3}=$ $\frac {1}{4}÷4=$ $0.36×\frac {7}{12}=$ $\frac {2}{3}÷\frac {4}{3}=$
$10+1\% =$ $5\% -0.5\% =$ $\frac {2}{5}×8+\frac {3}{5}×8=$ $3+7×\frac {1}{10}=$
$\frac {5}{8}÷\frac {1}{10}=$ $1.8÷\frac {3}{5}=$ $5÷\frac {5}{9}×\frac {4}{9}=$ $(4+\frac {1}{3})×\frac {3}{4}=$
$3×\frac {1}{3}=$ $\frac {1}{4}÷4=$ $0.36×\frac {7}{12}=$ $\frac {2}{3}÷\frac {4}{3}=$
$10+1\% =$ $5\% -0.5\% =$ $\frac {2}{5}×8+\frac {3}{5}×8=$ $3+7×\frac {1}{10}=$
$\frac {5}{8}÷\frac {1}{10}=$ $1.8÷\frac {3}{5}=$ $5÷\frac {5}{9}×\frac {4}{9}=$ $(4+\frac {1}{3})×\frac {3}{4}=$
答案:
$3. 1 \frac{1}{16} 0.21 \frac{1}{2} 10.01 4.5\% 8 3\frac{7}{10} \frac{25}{4} 3 \frac{3}{4} \frac{13}{4}$
4. 下面各题怎样简便就怎样计算。
$\frac {3}{5}+\frac {5}{12}÷\frac {7}{9}×\frac {4}{5}$ $(\frac {7}{8}-\frac {1}{6}-\frac {1}{4})×24$ $1.85×\frac {3}{14}+1.15×\frac {3}{14}-\frac {3}{14}$
$(1-\frac {1}{3})×\frac {15}{16}+\frac {1}{4}$ $(0.4+\frac {4}{25}÷1.6)÷2.5$ $\frac {4}{9}÷[2.4-(\frac {1}{5}+\frac {1}{3})]$
$\frac {3}{5}+\frac {5}{12}÷\frac {7}{9}×\frac {4}{5}$ $(\frac {7}{8}-\frac {1}{6}-\frac {1}{4})×24$ $1.85×\frac {3}{14}+1.15×\frac {3}{14}-\frac {3}{14}$
$(1-\frac {1}{3})×\frac {15}{16}+\frac {1}{4}$ $(0.4+\frac {4}{25}÷1.6)÷2.5$ $\frac {4}{9}÷[2.4-(\frac {1}{5}+\frac {1}{3})]$
答案:
$4. 1\frac{1}{35} 11 \frac{3}{7} \frac{7}{8} \frac{1}{5} \frac{5}{21}$
5. 解方程。
$x-\frac {1}{4}x=6$ $x:\frac {3}{8}=\frac {4}{3}$ $\frac {1}{4}x-1.5=1.8$
$x-\frac {1}{4}x=6$ $x:\frac {3}{8}=\frac {4}{3}$ $\frac {1}{4}x-1.5=1.8$
答案:
$5. x=8 x=\frac{1}{2} x=13.2$
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