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第65頁

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?$=\frac {5}{10}$?

?$=\frac {4}{10}$?

?$=\frac {8}{10}$?

?$=\frac {3}{10}$?

?$=\frac {8}{10}$?

?$=\frac 46$?

?$=\frac {4}{16}$?

?$=\frac {4}{10}$?

?$=\frac 49$?

?$=\frac {4}{6}$?

?$\frac 45=\frac {4×4}{5×4}=\frac {16}{20}$?

答：分母應(yīng)該乘?$4$?才能使分數(shù)的大小不變，變化后的分數(shù)是?$\frac {16}{20}。$?

?$\frac {16}{24}=\frac {16÷8}{ 24÷8}=\frac 23$?

答：分子應(yīng)該除以?$8$?才能使分數(shù)的大小不變，變化后的分數(shù)是?$\frac 23。$?

?$\frac 3{11}=\frac {36}{132}$?

?$\frac 7{12}=\frac {77}{132}$?

?$\frac 3{11}\lt \frac 7{12}$?

?$\frac 5{18}=\frac {15}{54}$?

?$\frac 7{27}=\frac {14}{54}$?

?$\frac 5{18}\gt \frac 7{27}$?

?$\frac 7{12}=\frac {56}{96}，$??$\frac 5{32}=\frac {15}{96}，$??$\frac 9{48}=\frac {18}{96}$?

?$\frac 7{12}\gt \frac 9{48}\gt \frac 5{32}$?

$??\frac {2}{3}??$

$??\frac {1}{2}??$

$??\frac {1}{3}??$

$??\frac {3}{2}??$

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