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三分之一减三加三分之八等于多少?

(1/3)-3+(8/3)=0

先通分,再加减 8又1/3-1/2 =8又2/6-3/6 =7又5/6

1/3-3=1/3-9/3=-8/3 1/3-3+8/3=-8/3+8/3=0

1-1/3-1/8-1/6 =1-1/8-(1/3+1/6) =1-1/8-1/2 =8/8-1/8...

这样子

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1/3-1/9 =3/9-1/9 =2/9

13/8+1/9-1/3 =13/8+1/9-3/9 =13/8-2/9 =117/72-16/72...

8/9+2/3-1/3 =8/9+(2/3-1/3) =8/9-1/3 =8/9-3/9 =5/9 ...

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