Question

x的2次方-2x分之x+2 再-去x2次方-4x+4分之x-1

Answer 1

x的2次方-2x分之x+2 再-去x2次方-4x+4分之x-1

=x(x-2)分之x+2 -(x-2)²分之x-1

=x(x-2)²分之(x+2)(x-2) -x(x-2)²分之x(x-1)

=x(x-2)²分之[(x+2)(x-2)-x(x-1)]

=x(x-2)²分之(x²-4-x²+x)

=x(x-2)²分之x-4