Question

已知x=根号3-1分之2求x²-2x+2的值

Answer 1

x=2/(√3-1)

=2(√3+1)/(3-1)

=√3+1

所以x-1=√3

x²-2x+2

=(x-1)²+1

=√3²+1

=3+1

=4