2+7/12+11/30+15/56-5/6-9/20-13/4
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2+7/12+11/30+15/56-5/6-9/20-13/4
=2+1/3+1/4+1/5+1/6+1/7+1/8-(1/2+1/3)-(1/4+1/5)-3-1/4
=2-2-1-1/2+(1/6+1/7+1/8)-1/4
=15/56-1/4-(3/6-1/6)-1
=15/56-14/56-1-1/3
=-(55/56+1/3)
=-(55×3+1×56)/(56×3)
=-221/168
=-168分之221
=2+1/3+1/4+1/5+1/6+1/7+1/8-(1/2+1/3)-(1/4+1/5)-3-1/4
=2-2-1-1/2+(1/6+1/7+1/8)-1/4
=15/56-1/4-(3/6-1/6)-1
=15/56-14/56-1-1/3
=-(55/56+1/3)
=-(55×3+1×56)/(56×3)
=-221/168
=-168分之221
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