计算:2-5/12-13/15+1/5+1/12-3又19/20=().
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计算:2-5/12-13/15+1/5+1/12-3又19/20=().
计算:2-5/12-13/15+1/5+1/12-3又19/20=().
计算:2-5/12-13/15+1/5+1/12-3又19/20=().
2-5/12-13/15+1/5+1/12-79/20
=(-5/12+1/12)+(1/5-13/15)+(2-79/20)
=-1/3-4/5-39/20
=-37/12