﹙1﹚1÷xy²,c÷x﹙a-b﹚,2÷y﹙b-a﹚g公分母=xy²(a-b);所以分别是1÷xy²=(a-b)/(xy²(a-b));c÷x﹙a-b﹚=cy²/(xy²(a-b)),;2÷y﹙b-a﹚=-2xy/(xy²(a-b));很高兴为您解答,skyhunte...