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第6頁

信息發(fā)布者:
?$=-2.8+(3.6-3.6)$?
?$=-2.8+0$?
?$=-2.8$?
?$=-(23+17)+58$?
?$=58-40$?
?$=18$?
?$=-0.5+(2 \frac {3}{4}+2 \frac {1}{4})$?
?$=-0.5+5$?
?$=4.5$?
?$=22-(4+2)$?
?$=22-6$?
?$=16$?
?$=-(54+3)+7.5$?
?$=-57+7.5$?
?$=-49.5$?
?$=(13+17)-(12+18)$?
?$=30-30$?
?$=0$?
?$=(5.7-3.7)-(2.4+4.6)$?
?$=2-7$?
?$=-5$?
?$=-(\frac 13+\frac 23)+(13+17)$?
?$=-1+30$?
?$=29$?
?$=-(3.14-2.14)-(7.96-4.96)$?
?$=-1-3$?
?$=-4$?
?$=3 \frac {7}{12}-1 \frac {1}{4}-2 \frac {7}{12}+1 \frac {1}{4}-4 \frac {1}{8}$?
?$=(3 \frac {7}{12}-2 \frac {7}{12})+(1 \frac {1}{4}-1 \frac {1}{4})-4 \frac {1}{8}$?
?$=1+0-4 \frac {1}{8}$?
?$=-3 \frac {1}{8}$?