(-1/2)-(+4/3)-7/4+(-3)怎么算?
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解:(-1/2)-(+4/3)-7/4+(-3)
=(-1/2)+(-4/3)+(-7/4)+(-3)
=-[(1/2)+(4/3)+(7/4)+3]
=-{(1/2)+[1+(1/3)]+[1+(3/4)]+3}
=-[(1/2)+1+(1/3)+1+(3/4)+3]
=-[(1/2)+(1/3)+(3/4)+5]
=-[(6/12)+(4/12)+(9/12)+5]
=-[(19/12)+5]
=-{[1+(7/12)]+5}
=-[6+(7/12)]
=-6又7/12
=(-1/2)+(-4/3)+(-7/4)+(-3)
=-[(1/2)+(4/3)+(7/4)+3]
=-{(1/2)+[1+(1/3)]+[1+(3/4)]+3}
=-[(1/2)+1+(1/3)+1+(3/4)+3]
=-[(1/2)+(1/3)+(3/4)+5]
=-[(6/12)+(4/12)+(9/12)+5]
=-[(19/12)+5]
=-{[1+(7/12)]+5}
=-[6+(7/12)]
=-6又7/12
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