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第7頁

信息發(fā)布者:
?$=(10+2)-(8+1)$?
?$=12-9$?
?$=3$?
?$=(72-32)-(27+8)$?
?$=40-35$?
?$=5$?
?$=-(27-17)-(14-8)$?
?$=-10-6$?
?$=-16$?
?$=-(\frac {3}{7}-\frac {2}{7})-(1 \frac {3}{5}-\frac {3}{5})$?
?$=-\frac {1}{7}-1$?
?$=-1 \frac {1}{7}$?
?$=-(1.5+5 \frac {1}{2})+(4 \frac {1}{4}+2.75)$?
?$=-7+7$?
?$=0$?
?$=(\frac 12-\frac 12)-(\frac 23+\frac 13)+\frac 47$?
?$=0-1+\frac 47$?
?$=-\frac 37$?
?$=(12-2)+(7 \frac {1}{3}-1 \frac {1}{3})$?
?$=10+6$?
?$=16$?
?$=(4 \frac {1}{3}-1 \frac {1}{3})-(5.5+3 \frac {1}{2})$?
?$=3-9$?
?$=-6$?
?$=(0.56+0.44)-(0.9+8.1)$?
?$=1-9$?
?$=-8$?
?$=(1-2)+(3-4)+···+(99-100)$?
?$=-1+(-1)+···+(-1)$?
?$=-50$?