4 F X    X  X 2   X 1A)   ;1  B)  1;   C) R D) ...

450 CAU TRAC NGHIEM THPT HAY 450 CAU TRAC NGHIEM THPT HAY

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Câu 81.4 ^{f x}   ^ ^x ^ ^x ² ^{ } ^x ¹

a)  ^ ^;1  b)  ^1; ^  c) R d)  ^0; 