Question

集合{3,x,x^2-2x}中,x应满足的条件是?

Answer 1

x=x^2-2x

x^2-3x=0

x(x-3)=0

x1=0 x2=3

3=x^2-2x

x^2-2x-3=0

(x-3)(x+1)=0

x1=3 x2=-1

x应满足的条件是x≠0,-1,3