Question

求比例式中的x (a平方-2a+1):(a-2)=x:(a平方-3a+2)

Answer 1

内项积等于外项积

(a-2)x=(a^2-2a+1)(a^2-3a+2)=(a-1)^2(a-1)(a-2)

x=(a-1)^3=a^3-3a^2+3a-1