C; 77. C; 78. D; 79. C; 80. D; 81. D; 82. A; 83. C; 84. C; 85. D;...

76. - 182 CAU TRAC NGHIEM TOAN HK2 L4 CO DA
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76. C; 77. C; 78. D; 79. C; 80. D; 81. D; 82. A; 83. C; 84. C; 85. D; 86. D; 87. A; 88. B; 89. A; 90. A;