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第12頁(yè)

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?$=-7+21-27-5$?
?$=-18$?
?$=18-12-21+12$?
?$=(18-21)+(12-12)$?
?$=-3$?
?$=0.35-0.6+0.25-5.4$?
?$=(0.35+0.25)-(0.6+5.4)$?
?$=0.6-6$?
?$=-5.4$?
?$=-20+14-18-13$?
?$=-37$?
?$=1 \frac {1}{8}-3 \frac {3}{4}-\frac {1}{8}-\frac {1}{4}$?
?$=(1 \frac {1}{8}-\frac {1}{8})-(3 \frac {3}{4}+\frac {1}{4})$?
?$=1-4$?
?$=-3$?
?$=5.7-8.4-4.2+10$?
?$=3.1$?
?$=1 \frac {1}{3}-1 \frac {1}{5}+\frac {5}{3}+\frac {3}{5}+3 \frac {3}{5}$?
?$=(1 \frac {1}{3}+\frac {5}{3})+(\frac {3}{5}+3 \frac {3}{5}-1 \frac {1}{5})$?
?$=3+3$?
?$=6$?
?$=\frac {2}{5}-\frac {3}{2}-2 \frac {1}{4}+2 \frac {3}{4}$?
?$=\frac {2}{5}-\frac {3}{2}+\frac {1}{2}$?
?$=-\frac {3}{5}$?
?$=1-\frac {1}{2}+\frac {1}{2}-\frac {1}{3}+\frac {1}{3}-\frac {1}{4}+···+\frac {1}{99}-\frac {1}{100}$?
?$=1-\frac {1}{100}$?
?$=\frac {99}{100}$?
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