已知A(m-1,2),B(1,1),C(3,m*2-m-1)三点共线,求m的值

2020-09-16 社会 52阅读
slope of AB = slope of BC
(2-1)/(m-1-1)= (m^2-m-1-1)/(3-1)
1/(m-2)= (m^2-m-2)/2
(m-2)(m^2-m-2) = 2
(m^2-4m+4)(m+1) =2
m^3-4m^2+4m+m^2-4m+4 = 2
m^3-3m^2+2=0
(m-1)(m^2+2m +2) =0
m=1
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