解析:1)、AB中点M坐标为(5/2,3/2) 则CM=√[(3-5/2)^2+(4-3/2)^2]=√26/2
2)、设P(m.n) ∵PQ‖BC∴△APQ∽△ABC,∴S△APQ/S△ABC=(AP/AB)^2若S△APQ:S△PBCQ=4:5,即S△APQ/S△ABC=4:9AP/AB=2:3, AP:PB=2:1,则m=(1+2*4)/(1+2)=3
n=(2+2*1)/(1+2)=4/3 若S△APQ:S△PBCQ=5:4,即S△APQ/S△ABC=5:9AP/AB=√5:3, AP:PB=√5:(3-√5)=(5+3√5):4,则m=[1+(5+3√5)/4*
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