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第11頁

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?$=10+6+8-2$?

?$=22$?

?$=-17-6+23+20$?

?$=20$?

?$=4.7+8.9-7.5-6$?

?$=0.1$?

?$=-27-32-8+72$?

?$=5$?

?$=-7-33-10+16$?

?$=-50+16$?

?$=-34$?

?$=12+18-7-20$?

?$=3$?

?$=2 \frac {2}{3}+6 \frac {3}{10}-\frac {5}{3}+1 \frac {3}{5}$?

?$=(2 \frac {2}{3}-\frac {5}{3})+(6 \frac {3}{10}+1 \frac {3}{5})$?

?$=1+7 \frac {9}{10}$?

?$=8 \frac {9}{10}$?

?$=\frac {5}{6}-\frac {3}{4}-\frac {1}{4}+\frac {1}{6}$?

?$=(\frac {5}{6}+\frac {1}{6})-(\frac {3}{4}+\frac {1}{4})$?

?$=1-1$?

?$=0$?

?$=5.6-7.6+8.3-5.3-1$?

?$=(5.6-7.6)+(8.3-5.3)-1$?

?$=-2+3-1$?

?$=0$?

?$=(1-3)+(5-7)+(9-11)+···+(97-99)$?

?$=(-2)+(-2)+(-2)+···+(-2)$?

?$=-2×25$?

?$=-50$?

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