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第9頁

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?$=-3-\frac {1}{3}+5+1 \frac {1}{3}$?
?$=(5-3)+(1 \frac {1}{3}-\frac {1}{3})$?
?$=2+1$?
?$=3$?
?$=-12-5-14+39$?
?$=-31+39$?
?$=8$?
?$=\frac {1}{4}-\frac {1}{8}-\frac {3}{4}-\frac {7}{8}$?
?$=-(\frac {3}{4}-\frac {1}{4})-(\frac {1}{8}+\frac {7}{8})$?
?$=-\frac {1}{2}-1$?
?$=-1 \frac {1}{2}$?
?$=\frac {5}{6}-2.5+1 \frac {1}{6}-0.5$?
?$=(\frac {5}{6}+1 \frac {1}{6})-(2.5+0.5)$?
?$=2-3$?
?$=-1$?
?$=5 \frac {3}{4}+4 \frac {2}{3}-5 \frac {3}{4}-7 \frac {2}{3}$?
?$=(5 \frac {3}{4}-5 \frac {3}{4})-(7 \frac {2}{3}-4 \frac {2}{3})$?
?$=0-3$?
?$=-3$?
?$=\frac {2}{9}+1 \frac {5}{6}-1 \frac {2}{9}-\frac {1}{3}$?
?$=-(1 \frac {2}{9}-\frac {2}{9})+(1 \frac {5}{6}-\frac {1}{3})$?
?$=-1+1 \frac {1}{2}$?
?$=\frac {1}{2}$?
?$=(301-301)+(125-75)$?
?$=0+50$?
?$=50$?
?$=-8+15-9+12$?
?$=7-9+12$?
?$=10$?
?$=-\frac {31}{3}+\frac {58}{7}-\frac {9}{7}-\frac {32}{3}$?
?$=-(\frac {31}{3}+\frac {32}{3})+(\frac {58}{7}-\frac {9}{7})$?
?$=-21+7$?
?$=-14$?
?$=-4 \frac {7}{9}+3 \frac {1}{6}-\frac {2}{9}+6 \frac {1}{6}$?
?$=-(4 \frac {7}{9}+\frac {2}{9})+(3 \frac {1}{6}+6 \frac {1}{6})$?
?$=-5+9 \frac {1}{3}$?
?$=4 \frac {1}{3}$?
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