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Ta có : \(3n-1⋮n-1\)
\(\Leftrightarrow3n-3+2⋮n-1\)
\(\Leftrightarrow3.\left(n-1\right)+2⋮n-1\)
\(\Leftrightarrow2⋮n-1\)
\(\Leftrightarrow n-1\inƯ\left(2\right)\)
Mà \(Ư\left(2\right)=\left\{1;-1;2;-2\right\}\)
\(\Rightarrow n-1\in\left\{1;-1;2;-2\right\}\)
\(\Rightarrow n\in\left\{2;0;3;-1\right\}\)
Vậy \(n\in\left\{2;0;3;-1\right\}\)
Chúc bạn học giỏi !!! Tham khảo cách của mk nha !!!
Bn ơi ko phải cuốn đấy,cuốn đấy mik có rồi nhé , '' Bài tập trắc nghiệm Tiếng Anh 9 - Mai Lan Hương pdf ''
--Maize (n) Ngô,Bắp
-> He loves eating maize because it is his favorite food.
-Hot dog (n) Xúc Xích
-> Hot dog is one of the most delicious fast foods.
-Grocery store (n) Cửa hàng tạp hóa
-> He bought the lamp at the grocery store.
-Baseball (n) Bóng chày
-> He plays baseball very well.
-Part-time (adv) Bán thời gian
-> He does voluntary works as a part-time job.
-Exchange (v.adj.n) Trao đổi.
-> She is an exchange student.
Cô ấy đã không được nhìn thấy nha bạn!
She hasnot been seen since she moved to the new place.
P/sL Mình cx kém Anh lắm!
- when: HTĐ - TLĐ, QKĐ - QKHT, QKĐ - QKĐ
Ex: When I come home, she will do homework.
- Before: QKĐ - QKHT
Ex: Before she said, I had known.
- After: QKHT - QKĐ
Ex: After I had known, she said.
- While/When/As: HTTD - HTĐ, QKTD - QKĐ
Ex: While I am cleaning the house, the phone rings
- Since: QKĐ - HTHT
Ex: Since I was 10 years old, I have lived there
- By the time: by / by the time + HTĐ - QKHT
Ex: By the time I came, he had left
- Until / when / as soon as + HTĐ - TLĐ
Ex: Until she comes back, I will wait here.
- It was not until + time + that + QKĐ
Ex: It was not until midnight that I sleep
had done .
Công thức:
❄ Before + S + V2, S + had + V3.
❄ After + S + V3, S + V2.
dịch : không ai trong số bạn bè của tôi sống gần nhà tôi .
\(\Rightarrow\)none of my friend live near my house . it is correct
đúng
Ý em muốn hỏi từ "friends" này chia live , hay lives mới đúng ạ
thì sao bn??
n có nhìu giá trị hay sao ik
VD:n=4
-HỌC TỐT :L-