Ta có: \(d:x-y-2=0\Leftrightarrow\hept{\begin{cases}x=t\\y=t-2\end{cases}}\), M thuộc d suy ra \(M\left(t;t-2\right)\)

\(\Rightarrow\overrightarrow{MG}=\left(3-t;4-t\right)\Rightarrow\overrightarrow{MA}=3\overrightarrow{MG}=\left(9-3t;12-3t\right)\Rightarrow A\left(9-2t;10-2t\right)\)

\(\Rightarrow\overrightarrow{AN}=\left(2t-4;2t-6\right)\)

Vì \(\overrightarrow{AN}\perp\overrightarrow{MG}\)nên \(\overrightarrow{AN}.\overrightarrow{MG}=0\Rightarrow\left(2t-4\right)\left(3-t\right)+\left(2t-6\right)\left(4-t\right)=0\)

\(\Leftrightarrow t^2-6t+9=0\Leftrightarrow t=3\Rightarrow M\left(3;1\right)\)

Đường thẳng BC: đi qua \(M\left(3;1\right)\),VTPT\(\overrightarrow{MG}\left(0;1\right)\Rightarrow BC:y-1=0.\)

Ta có: d:x−y−2=0⇔{

, M thuộc d suy ra M(t;t−2)

⇒→MG=(3−t;4−t)⇒→MA=3→MG=(9−3t;12−3t)⇒A(9−2t;10−2t)

⇒→AN=(2t−4;2t−6)

Vì →AN⊥→MGnên →AN.→MG=0⇒(2t−4)(3−t)+(2t−6)(4−t)=0

⇔t2−6t+9=0⇔t=3⇒M(3;1)

Đường thẳng BC: đi qua M(3;1),VTPT→MG(0;1)⇒BC:y−1=0.

:(  Mong các admin không post cả chỗ gợi ý trả lời ( một số bạn sẽ có hành vi gian lận )

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1. My brother, who is in the army he => \(\varnothing\) came to see us

2. John Graham's latest film that is set in the north of Australia is => has been his first for more than five years

3. The path was made by walkers who crossed => crossing the mountains each summer

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6. The building where I used to work in => \(\varnothing\) had 24 floors

7. The reason because => why I didn't know was that no one had told me

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10.This is the ball which Dennis scored three goals within the final

11.The airline, which head office is situated in France, has recently begun to fly => flying between Paris and Lima

12. I bought the present that I gave him it => \(\varnothing\) for Christmas ịn Japan

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\(f(x)>0 \leftrightarrow 2x-m > 0 \leftrightarrow x> \frac{m}{2} để f(x) >0 với mọi x >1 thì \frac{m}{2} \le 1 \leftrightarrow m \le 2\)

Chương tình dưới đây giúp xóa file: New folder

>>> os.listdir()

['20200924.py','202000925.txt','code','my_python','my_test','new_folder']

>>> os.remove('20200925.txt')

>>> os.listdir()

['20200924.py','code','my_python','my_test','new_folder']

>>> os.rmdir('new_folder')

>>> os.listdir()

['20200924.py','code','my_python','my_test']