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-1

Mark the letter A, B, C or D to indicate the sentence that is closest in meaning to each of the following questions.

Question 26:  Peter emphasized the importance of being thoughtful toward one another.

A. Peter said that people should consider the feelings of others.

B. Peter said that people should not talk too much.

C. Peter said that people should discuss thoughtful topic.

D. Peter said that people should not be too serious.

Ta có \(\left(x^2+4x+7\right)⋮\left(x+4\right)\)

\(\Rightarrow\left(x\cdot x+4\cdot x+7\right)⋮\left(x+4\right)\)

Ta thấy có chung x, nên ta có:

\(\Rightarrow x\left(x+4\right)+7⋮\left(x+4\right)\)

Vì \(x\left(x+4\right)+7⋮\left(x+4\right)\)nên

\(x\left(x+4\right)⋮\left(x+4\right)\)và \(7⋮\left(x+4\right)\)hoặc \(x+4\in BC\left(7\right)\)hay \(x+4\in\left\{-7;-1;1;7\right\}\)

Ta có bảng sau:

Vậy \(x\in\left\{-11;-5;-3;3\right\}\)

Có thể có bao nhiêu hexapeptit mà trong phân tử chứa 3 mắt xích alanin, 2 mắt xích glyxin và 1 mắt xích valin, có đầu N là alanin và đầu C là valin

A. 4

B. 5

C. 6

D. 7

8 dung 10000000000000000000000% luon

\(1\frac{1}{2}+\frac{2}{3}+\frac{5}{11}=\frac{3}{2}+\frac{2}{3}+\frac{5}{11}=\frac{99}{66}+\frac{44}{66}+\frac{30}{66}=\frac{173}{66}\)