Question

初二分式的加减第二课时一道计算题,老师说答案等于xy,我怎么都没算出来,求救

Answer 1

原式=y(x^2-4y^2)/(x+2y)^2.x(x+2y)/x-2y

=y(x+2y)x-2y()/(x+2y)^2.x(x+2y)/x-2y

=xy