1 for helping

2 at playing

3 of singing - dancing

4 to seeing

5 of driving

6 in listening

7 on moving

8 of joining

9 to carrying

10 to getting

\(M=\left\{-12;-2;...;22;32\right\}\)

Tk:

M={−12;−2;...;22;32}

M = { -12; -2; ...; 22; 32}

a) Diện tích xung quanh của khối rubik là:

\(\dfrac{1}{2}\cdot234\cdot67,5=7897,5\left(mm^2\right)\)

Diện tích mỗi mặt của khối rubik là:

\(7897,5:3=2632,5\left(mm^2\right)\)

Diện tích toàn phần của khối rubik là:

\(2632,5\cdot4=10530\left(mm^2\right)\)

\(---\)

b) Thể tích của khối rubik là:

\(\dfrac{1}{3}\cdot2632,5\cdot63,7=55896,75\left(mm^3\right)\)

Vậy: ...

#\(Toru\)

Bài 2

b)\(\overrightarrow{AN}=\dfrac{1}{2}\left(\overrightarrow{AB}+\overrightarrow{AC}\right)\)

\(\overrightarrow{AK}=\dfrac{1}{2}\left(\overrightarrow{AB}+\overrightarrow{AN}\right)=\dfrac{1}{2}\left(\overrightarrow{AB}+\dfrac{1}{2}\overrightarrow{AB}+\dfrac{1}{2}\overrightarrow{AC}\right)=\dfrac{3}{4}\overrightarrow{AB}+\dfrac{1}{4}\overrightarrow{AC}\)

d)\(S_{ABC}=24\Leftrightarrow\dfrac{1}{2}AN.BC=24\Leftrightarrow AN=6\left(cm\right)\)

\(\left|\overrightarrow{AB}+\overrightarrow{AC}\right|=\left|2.\dfrac{1}{2}\left(\overrightarrow{AB}+\overrightarrow{AC}\right)\right|=\left|2\overrightarrow{AN}\right|=2.AN=12\left(cm\right)\)

Bài 3:

b)\(\overrightarrow{BG}=\overrightarrow{BC}+\overrightarrow{CG}=\overrightarrow{BC}+\dfrac{3}{4}\overrightarrow{CA}=\overrightarrow{BC}+\dfrac{3}{4}\left(\overrightarrow{BA}-\overrightarrow{BC}\right)=\dfrac{1}{4}\overrightarrow{BC}+\dfrac{3}{4}\overrightarrow{BA}=\dfrac{1}{4}\overrightarrow{v}+\dfrac{3}{4}\overrightarrow{u}\)

c)Nhìn hình thấy ko thẳng nên đề sai

1B

2 bạn có chép đúng đề?

3D

4B

5A

6A

7A

8A

9B

10B

11C

12A

13C

14B

15A

16C

0.125*37*8

=(0.125*8)*37

=1*37

0,125 x 37 x 8

= ( 0,125 x 8 ) x 37 

= 1 x 37 

= 37

0.125*37*8

=(0.125*8)*37

=1*37

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