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第36頁

信息發(fā)布者：
?$\frac {1}{7}$?
?$\frac {17}{18}$?
?$\frac {1}{4}$?
?$\frac {7}{15}$?
3
?$\frac {1}{12}$?
?$\frac {20}{3}$?
?$\frac {15}{16}$?
C
C
C



減
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。
?$=\frac {10}{9}×(\frac {10}{9}×\frac {10}{9}-\frac {10}{9}-\frac {1}{9})$?
?$=\frac {10}{9}×(\frac {100}{81}-\frac {11}{9})$?
?$=\frac {10}{9}×\frac {1}{81}$?
?$=\frac {10}{729}$?
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