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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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