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第9頁

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加法
C
C
?$=-7-3-10+16$?
?$=-4$?
?$=-16+10-5-17$?
?$=-28$?
?$=23-17+6-22$?
?$=-10$?
?$=-2+3+1-3+2-4$?
?$=-3$?
?$=4.7+8.9-7.5-6$?
?$=0.1$?
?$=-6.3+7.5+4-1.2$?
?$=2$?
?$=(10-15)+(26-24)+(18-42)$?
?$=-5+2-24$?
?$=-27$?
?$=7-6-7+6$?
?$=(7-7)+(6-6)$?
?$=0$?
?$=-1.3+2.6-0.7-0.6+3$?
?$=-(1.3+0.7)+(2.6-0.6)+3$?
?$=-2+2+3$?
?$=3$?
?$=-3 \frac {1}{4}+18 \frac {13}{15}-2 \frac {2}{3}+4 \frac {2}{3}+1 \frac {1}{4}$?
?$=(-3 \frac {1}{4}+1 \frac {1}{4})+(4 \frac {2}{3}-2 \frac {2}{3})+18 \frac {13}{15}$?
?$=-2+2+18 \frac {13}{15}$?
?$=18 \frac {13}{15}$?