计划的时间x4[1/(x+6)+1/(x-4)]+(x-4)/(x+6)=1=x/(x+6)+4/(x-4)=1+4/(x-4)-6/(x+6)4/(x-4)-6/(x+6)=0,4/(x-4)=6/(x+6),4(x+6)=6(x-4),2x=48,x=24甲单独做要24+6=30,乙单独做=24-4=20甲乙两队合作,（1/(1/30+1/20)=12...