89.⑤90.4x²-10x+991.2092.(1)유리수범위:(x²-2)(x²+5)(2)실수범위:(x+√2)(x-√2)(x²+5)(3)복소수범위:(x+√2)(x-√2)(x+√5i)(x-√5i)93.⑤94.⑤
당신은 어느 그룹입니까?