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?$ \frac {1}{4}×\frac {2}{3}=\frac {1}{6}$?

?$ \frac {5}{2}×\frac {3}{10}=\frac {3}{4}(千克)$?

?$ \frac {5}{2}×\frac {1}{2}=\frac {5}{4}(噸)$?

?$ \frac {2}{3}×\frac {1}{4}=\frac {1}{6}(公頃)$?

?$ \frac {2}{3}×\frac {3}{4}=\frac {1}{2}(公頃)$?

?$ 答：\frac {1}{4}小時(shí)耕地\frac {1}{6}公頃，\frac {3}{4}小時(shí)耕地\frac {1}{2}公頃。$?

$\frac{4}{11}×\frac{3}{2}=\frac{6}{11}$

$\frac{4}{11}+\frac{6}{11}=\frac{10}{11}＜1$

$答:不能.$

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