16 . ( - 27 ) + 16 . ( - 36 ) + ( - 16 ) . 37

= 16 . ( - 27 ) + 16 . ( - 36 ) + 16 .(-1) .37

=16 . ( - 27 ) + 16 . ( - 36 ) + 16. ( -37)

=16.  [ (-27) +(-36) + (-37) ]

=16.(-100)

= -1600

Em chỉ k cho người đầu tiên cos câu trả lời hay và chính xác nhất ạ . Em chân thành cảm ơn  nhiều ạ 

Em cảm ơn chị nhiều ạ

16 B

17 A

18 C

19 B

20 B

C

C

C?

1 C

2 D

3 C

4 A

5 C

6 A

7 B

8 D

9 A

10 B

11 C

12 B

13 B

14 A

15 B

16 C

11 D

12 B

13 C

14 D

15 C

16 B

D. Bị lệch về phía đáy

\(a,CH_2=CH-CH_3+H_2\rightarrow\left(Ni,t^o\right)CH_3-CH_2-CH_3\\ CH\equiv C-CH_3+2H_2\rightarrow\left(Ni,t^o\right)CH_3-CH_2=CH_3\\ b,CH\equiv C-CH_3+H_2\rightarrow\left(\dfrac{Pd}{PbCO_3}\right)CH_2=CH-CH_3\\ c,CH_2=CH-CH_3+Br_2\rightarrow\left(CCl_4\right)CH_2Br-BrCH-CH_3\\ CH\equiv C-CH_3+Br_2\rightarrow\left(CCl_4\right)CH_2Br=BrC-CH_3\)

\(d,CH\equiv C-CH_3+AgNO_3+NH_3\rightarrow AgC\equiv C-CH_3+NH_4NO_3\\ e,CH_2=CH-CH_3+H_2O\rightarrow\left(H^+\right)CH_3-CH_2-CH_2-OH\\ CH\equiv C-CH_3+H_2O\rightarrow\left(H^+\right)CH_2=CH-CH_2-OH\\ f,CH_2=CH-CH_3+HCl_{dư}\rightarrow CH_3-CHCl-CH_3\\ CH\equiv C-CH_3+HCl_{dư}\rightarrow CH_2=CCl-CH_3\)

Đặt \(\overrightarrow{d}=\left(x;y;z\right)\Rightarrow\left\{{}\begin{matrix}\overrightarrow{a}.\overrightarrow{d}=x+y-2z\\\overrightarrow{b}.\overrightarrow{d}=2x-y+2z\\\overrightarrow{c}.\overrightarrow{d}=-2x+3y-2z\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}x+y-2z=4\\2x-y+2z=5\\-2x+3y-2z=7\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=3\\y=6\\z=\dfrac{5}{2}\end{matrix}\right.\)

\(\Rightarrow\overrightarrow{d}=\left(3;6;\dfrac{5}{2}\right)\)