问题 填空题 已知y=x2-25x-4-x2-24-5x+2,则x2+y2=______. 答案 由题意得:x2-25x-4≥0,-x2-25x-4≥0,∴可得:x2-25x-4=0,解得:x2=2,∴可得y=2.故x2+y2=6.故填:6.