已知ײ―4×y―5y²＝0且×y≠0,则×／y＝﹙﹚

已知ײ―4×y―5y²＝0且×y≠0,则×／y＝﹙﹚
已知ײ―4×y―5y²＝0且×y≠0,则×／y＝﹙﹚

已知ײ―4×y―5y²＝0且×y≠0,则×／y＝﹙﹚
ײ―4×y―5y²=(x+y)(x-5y)=0
×y≠0,即x≠0,y≠0(保证y作为分母有意义）
x+y=0,或x-5y=0
x/y=-1或5