Cho a, b, c khác 0 thỏa mãn \(\dfrac{2a+b+c}{a}=\dfrac{a+2b+c}{b}=\dfrac{a+b+2c}{c}\)

Tính \(M=\dfrac{\left(a+b\right)\left(b+c\right)\left(c+a\right)^c}{abc}\)

Viết lại câu

1. It's a pity that you wrote that letter.

I'd ...............................

2. Iohn said to me "If I were you, I should try my best to learn English"

John advised ......................

3. I certainly don't intend to reply that rule letter.

I have ...............................

4. He drives so carefully that he has never had any accidents.

He such....................

Chọn đáp án đúng:

1. We ........ for her for ten minutes.

A. wait B. waited C. are waiting D. have been waiting

2.His father is not interested in tennis and .........

A. he doesn't, either B. so doesn't he C. neither does he D. neither is he

3. The little girl wasted an hour .......... for her picture book.

A. look B. looking C. to look D. looked

Chọn đáp án đúng

1. Long was not feeling well so we gave him ....... to do.

A. fewew work B. less work C. little work D. least works

2. My dog as well as my cats ...... twice a day.

A. eat B. eats C. has eaten D. have eaten

3. When I came into the class, I relized I knew ..........

A. them all B. all them C. they all D. all of they

4. Who broke the window? - ..........

A. I am B. I was, thanks. C. I did, sorry. D. I did, excuse me.

Chọn đáp án đúng:

1. Milk bottles can be ..... after being cleaned.

A. recycled B. reused C. broken D. reduced

2. What a person wears ......... not as important as his behavior.

A. is B. are C. was D. were

3. Your house has ......... nice future.

A. such B. such a C. so D. towards

4. First prize was awarded ............. Jackie Stevens, the smallest girl in the team.

A. with B. on C. to D. for

Gọi số dư khi chia a và b cho c là m.

Theo đề bài ta có:

a : c = d (dư m) => a = d.c + m

b : c = e (dư m) => b = e.c + m

=> a - b = (d.c + m) - (e.c + m)

= d.c + m - e.c - m

= (d.c - e.c) + (m - m)

= c. (d.e) chia hết cho c

Vậy a - b chia hết cho c (đpcm)

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