Question

Answer 1

Câu 10: Đặt E(x)=0

=>\(\left(x^2-4\right)\left(x^3+27\right)=0\)

=>\(\left[\begin{array}{l}x^2-4=0\\ x^3+27=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x^2=4\\ x^3=-27\end{array}\right.\Rightarrow\left[\begin{array}{l}x=2\\ x=-3\\ x=-2\end{array}\right.\)

=>Chọn C

Câu 9: A

Câu 8: A

Câu 7: B

Câu 6: Xét ΔABC có \(\hat{ABC}+\hat{ACB}+\hat{BAC}=180^0\)

=>\(\hat{ABC}+\hat{ACB}=180^0-70^0=110^0\)

=>\(\hat{IBC}+\hat{ICB}=\frac{110^0}{2}=55^0\)

Xét ΔIBC có \(\hat{IBC}+\hat{ICB}+\hat{BIC}=180^0\)

=>\(\hat{BIC}=180^0-55^0=125^0\)

=>Chọn A

Câu 5: C

Câu 4: D

Câu 3: B

Câu 2: A

Câu 1: C