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[" 79The lines "(p-q)x+(q-r)y+(r-p)=0],[...

[" 79The lines "(p-q)x+(q-r)y+(r-p)=0],[(q-r)x+(r-p)y+(p-q)=0,(r-p)x+(p-q)y+(q-r)-1],[]

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The lines (p-q)x+(q-r)y+(r-p)=0(q-r)x+(r-p)y+(p-q)=0 (r-p)x+(p-q)y+(q-r)=0

The lines (p-q)x+(q-r)y+(r-p)=0(q-r)x+(r-p)y+(p-q)=0,(x-p)x+(p-q)y+(q-r)=

The lines 1) (p-q)x+(q-r)y+(r-p)=0,2)(q-r)x+(r-p)y+(p-q)=0,3)(r-p)x+(p-q)y+(q-r)=0

x^(p-q).x^(q-r).x^(r-p)

Add p(p-q),q(q-r) and r(r-p)

Add: p(p-q),q(q-r) and r(r-p)

|(0,p-q,p-r),(q-p,0,q-r),(r-p,r-q,0)|=

The roots of the equation (q-r)x^2+(r-p)x+p-q=0 are (A) (r-p)/(q-r),1 (B) (p-q)/(q-r),1 (C) (q-r)/(p-q),1 (D) (r-p)/(p-q),1

The roots of the equation (q-r)x^2+(r-p)x+p-q=0 are (A) (r-p)/(q-r),1 (B) (p-q)/(q-r),1 (C) (q-r)/(p-q),1 (D) (r-p)/(p-q),1