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第108頁

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$2\frac {1}{4}$
$\frac {2}{3}$
$1\frac {7}{12}$
$1\frac {7}{24}$
$?=\frac {24}{40}+\frac {25}{40}?$
$? =\frac {49}{40}?$
$?=\frac {21}{36}-\frac {16}{36}?$
$? =\frac 5{36}?$
$?=\frac {10}{60}+\frac {21}{60}?$
$? =\frac {31}{60}?$
$?=\frac {36}{40}-\frac {15}{40}?$
$? =\frac {21}{40}?$
$?=\frac {16}{24}+\frac 9{24}?$
$? =\frac {25}{24}?$
$?=\frac {21}{45}-\frac {10}{45}?$
$? =\frac {11}{45}?$
$?=\frac {10}{24}+\frac {15}{24}?$
$? =\frac {25}{24}?$
$?=\frac {14}{12}-\frac 9{12}?$
$? =\frac 5{12}?$
$?=\frac 8{12}+\frac 9{12}+\frac 2{12}?$
$? =\frac {19}{12}?$
$?=\frac {14}{15}-\frac 5{15}-\frac 9{15}?$
$? =0?$
$?=\frac 7{12}+\frac 5{12}-\frac 25?$
$? =1-\frac 25?$
$? =\frac 35?$
$?=\frac 78-\frac 38-\frac 25?$
$? =\frac 12-\frac 25?$
$? =\frac 1{10}?$
$?=\frac 29-\frac 29+(\frac 56+\frac 56)?$
$? =\frac 53?$
$?=1-(\frac 17+\frac 57)?$
$? =1-\frac 67?$
$? =\frac 17?$
$?1-\frac 14-\frac 16=\frac 7{12}?$
$答：涂色部分的面積占長方形面積的? \frac 7{12}。?$
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