1.-70-28-(-19)+(+24)-(12)2.(+1/6)-(+1/3)-(-1/12)3.(+2又5/6)+(-3/8)+(1又1/3)+(-1/2)4.(-2/3)-1/12-(-1/4)5.-0.5-(-3又1/4)+2.75-(+7又1/2)6.(-4又7/9)-(-3又1/6)-(+2又2/9)+(-6又1/6)

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1.-70-28-(-19)+(+24)-(12)2.(+1/6)-(+1/3)-(-1/12)3.(+2又5/6)+(-3/8)+(1又1/3)+(-1/2)4.(-2/3)-1/12-(-1/4)

1.-70-28-(-19)+(+24)-(12)2.(+1/6)-(+1/3)-(-1/12)3.(+2又5/6)+(-3/8)+(1又1/3)+(-1/2)4.(-2/3)-1/12-(-1/4)5.-0.5-(-3又1/4)+2.75-(+7又1/2)6.(-4又7/9)-(-3又1/6)-(+2又2/9)+(-6又1/6)
1.-70-28-(-19)+(+24)-(12)
2.(+1/6)-(+1/3)-(-1/12)
3.(+2又5/6)+(-3/8)+(1又1/3)+(-1/2)
4.(-2/3)-1/12-(-1/4)
5.-0.5-(-3又1/4)+2.75-(+7又1/2)
6.(-4又7/9)-(-3又1/6)-(+2又2/9)+(-6又1/6)

1.-70-28-(-19)+(+24)-(12)2.(+1/6)-(+1/3)-(-1/12)3.(+2又5/6)+(-3/8)+(1又1/3)+(-1/2)4.(-2/3)-1/12-(-1/4)5.-0.5-(-3又1/4)+2.75-(+7又1/2)6.(-4又7/9)-(-3又1/6)-(+2又2/9)+(-6又1/6)
①-70-28-(-19)+(+24)-(12)=-98+19+24-12=-67
②(+1/6)-(+1/3)-(-1/12)=-1/6+1/12=-1/12
③.(+2又5/6)+(-3/8)+(1又1/3)+(-1/2)=17/6-3/8+4/3-1/2=5/8
④(-2/3)-1/12-(-1/4)=-8/12-1/12+3/12=-6/12=-1/2.
记住负负得正.