Bài tập 6.56 trang 193 SBT Toán 10

A. \(\dfrac{7}{4}\)                        

B. \(\dfrac{1}{4}\)                               

C. \(7\)                                

D. \(\dfrac{{13}}{4}\)

A. 4                           

B. 3             

C. 2                           

D. 1

(A) \(\displaystyle {5 \over {12}}\)

(B) \(\displaystyle 1\)

(C) \(\displaystyle {{ - 8} \over {11}}\)

(D) \(\displaystyle {{ - 10} \over {11}}\)

(A) \(\displaystyle {1 \over {17}}\)

(B) \(\displaystyle {5 \over 9}\)

(C) \(\displaystyle 13\)

(D) \(\displaystyle {2 \over 9}\)

(A) \(\displaystyle {{ - \sqrt 3 } \over 2}\)

(B) \(\displaystyle {{ - \sqrt 3 } \over 4}\)

(C) \(\displaystyle {{ - \sqrt 2 } \over 2}\)

(D) \(\displaystyle {{\sqrt 2 } \over 4}\)

(A) \(\displaystyle {1 \over 4}\)

(B) \(\displaystyle {{\sqrt 3 } \over 2}\)

(C) \(0\)

(D) \(\displaystyle {{2 - \sqrt 3 } \over 4}\)

(A) \(\displaystyle {{ - 4} \over {\sqrt 5 }}\)

(B) \(\displaystyle {2 \over {\sqrt 5 }}\)

(C) \(\displaystyle {-2 \over {\sqrt 5 }}\)

(D) \(\displaystyle {{ - 3} \over {\sqrt 5 }}\)

(A) \(\displaystyle {{\sqrt 3 } \over 2}\)

(B) \(\displaystyle {1 \over 2}\)

(C) \(\displaystyle {{\sqrt 2 } \over 2}\)

(D) \(\displaystyle {{ - 1} \over 2}\)