syms x a b c
solve('a*x^2+b*x+c=0',x)
syms p1 p2 p3 t1 t2 t3 t p n
f1=(p3+p2)*(t3-t2)/2+(p2+p1)*(t2-t1)/2-(p3+p1)*(t3-t1)/2
f2=(p3+p)*(t3-t)/2+(p+p1)*(t-t1)/2-(p3+p1)*(t3-t1)/2
f3=(p2-p)/(t2-t) f4=(p2-p1)/(t2-t1)
A=solve('(p3+p2)*(t3-t2)/2+(p2+p1)*(t2-t1)/2-(p3+p1)*(t3-t1)/2=n*((p3+p)*(t3-t)/2+(p+p1)*(t-t1)/2-(p3+p1)*(t3-t1)/2)','(p2-p)/(t2-t)=(p2-p1)/(t2-t1)',t,p)
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