1.(-23)-(-5/6)-7+(-2/3) 2.2/3+(-1/5)-1+1/3 3.(-16/12)+4/12 要计算过程,不要缩写!
展开全部
1.(-23)-(-5/6)-7+(-2/3)
=(-23)+5/6-7-4/6
=-30+1/6
=-29又5/6
2.2/3+(-1/5)-1+1/3
=1-1/5-1
=-1/5
3.(-16/12)+4/12
=-12/12
=-1 4.(-四又7/8)-(五又1/2)+(-四又1/4)-三又1/8=-39/8-11/2-17/4-25/8=-64/8-22/4-17/4=-8-39/4=-8-9又3/4=-17又3/4
=(-23)+5/6-7-4/6
=-30+1/6
=-29又5/6
2.2/3+(-1/5)-1+1/3
=1-1/5-1
=-1/5
3.(-16/12)+4/12
=-12/12
=-1 4.(-四又7/8)-(五又1/2)+(-四又1/4)-三又1/8=-39/8-11/2-17/4-25/8=-64/8-22/4-17/4=-8-39/4=-8-9又3/4=-17又3/4
追问
额
追答
.(-四又7/8)-(五又1/2)+(-四又1/4)-三又1/8
=-39/8-11/2-17/4-25/8
=64/8-22/4-17/4
=-8-39/4
=-8-9又3/4
=-17又3/4
展开全部
1.(-23)-(-5/6)-7+(-2/3)
2.2/3+(-1/5)-1+1/3
3.(-16/12)+4/12
4.(-四又7/8)-(五又1/2)+(-四又1/4)-三又1/8
1
(-23)-(-5/6)-7+(-2/3)
=(-23-7) + (5/6-4/6)
=-30 + 1/6
=-(30-1/6)
=-(29+5/6)
=-29又5/6
2
2/3+(-1/5)-1+1/3
=2/3+1/3-1-1/5
=1-1-1/5
=-1/5
3
(-16/12)+4/12
=(-16+4)/12
=-12/12
=-1
4
(-四又7/8)-(五又1/2)+(-四又1/4)-(三又1/8)
=(-4-5-4-3)+(-7/8-1/2-1/4-1/8)
=-16+(-7/8-4/8-2/8-1/8)
=-16+(-14/8)
=-16+(-1-3/4)
=-(17+3/4)
=-17又3/4
2.2/3+(-1/5)-1+1/3
3.(-16/12)+4/12
4.(-四又7/8)-(五又1/2)+(-四又1/4)-三又1/8
1
(-23)-(-5/6)-7+(-2/3)
=(-23-7) + (5/6-4/6)
=-30 + 1/6
=-(30-1/6)
=-(29+5/6)
=-29又5/6
2
2/3+(-1/5)-1+1/3
=2/3+1/3-1-1/5
=1-1-1/5
=-1/5
3
(-16/12)+4/12
=(-16+4)/12
=-12/12
=-1
4
(-四又7/8)-(五又1/2)+(-四又1/4)-(三又1/8)
=(-4-5-4-3)+(-7/8-1/2-1/4-1/8)
=-16+(-7/8-4/8-2/8-1/8)
=-16+(-14/8)
=-16+(-1-3/4)
=-(17+3/4)
=-17又3/4
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