第36页 - 六年级数学下册

$\frac {1}{7}$

$\frac {17}{18}$

$\frac {1}{4}$

$\frac {7}{15}$

3

$\frac {1}{12}$

$\frac {20}{3}$

$\frac {15}{16}$

C

减

除

$\frac {5}{11}$

$\frac {6}{11}$

6

乘法分配

$=6×(\frac {3}{4}+\frac {1}{4})$

$=6×1$

$=6$

=20-9

=11

$=1-\frac {8}{9}×\frac {6}{5}×\frac {3}{16}$

$=\frac {4}{5}$

$=\frac {7}{6}×(\frac {8}{6}-\frac {5}{6})$

$=\frac {7}{6}×\frac {1}{2}$

$=\frac {7}{12}$

=1/9×(77+22)

=1/9×99

=11

$=7+\frac {1}{7}$

$=7 \frac {1}{7}$

$\frac {1}{3}×(\frac {4}{5}+\frac {2}{3})=\frac {22}{45}($千克$)$

答：第三次用去$\frac {22}{45}$千克。

$=\frac {10}{9}×(\frac {10}{9}×\frac {10}{9}-\frac {10}{9}-\frac {1}{9})$

$=\frac {10}{9}×(\frac {100}{81}-\frac {11}{9})$

$=\frac {10}{9}×\frac {1}{81}$

$=\frac {10}{729}$