假设x y=﹣1,则x4 5x3y x2y 8x2y2 xy2 5xy3 y4的值等于 . 假设x y=﹣1,则x4 5x3y x2y 8x2y2 xy2 5xy3 y4的值等于 . 发布时间:2025-07-09 00:20:24