1,P(4t,0) Q(0,6-3t),2,t=1,3,当t=1,QP∥AB当t=18/19,EQ∥AB
(1)P(4t,0) Q(0,6-3t)(2)t=1(3)当t=1,QP∥AB当t=18/19,EQ∥AB
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