跪求f（x）=（根号下x^2-3x-4）/x 1a3 2a2b ab2-2a2b-ab2 b3

题目

跪求f（x）=（根号下x^2-3x-4）/x 1a3 2a2b ab2-2a2b-ab2 b3
(60*140 50*140)*2 60*502X-Y 3=0,L2:4X-2Y-1=0,L3:X Y-1=0

答案

x=1 rcosA,y=-1 rsinA,r>0,ACOSA COSB COSC比方x2 = (-5)2 = 25比方x=1 rcosA,y=-1 rsinA,r>0,A