Question

2.x平方减4y的平方除以x平方加4xy加4y的平方除以x平方加xy减6y的平方除以x平方加5xy加6y的平方3．

2.是题号

Answer 1

(x^2-4y^2)/(x^2+4xy+4y^2)/(x^2+xy-6y^2)/(x^2+5xy+6y^2)

=[(x+2y)(x-2y)/(x+2y)^2]/[(x+3y)(x-2y)/(x+2y)(x+3y)]

=[(x-2y)/(x+2y)]*(x+2y)/(x-2y)

=1