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10 tháng 11 2021
Vì....ko biết

mik chẳng bít là toán lớp mấy đou

Gần như không có ai đầu top mà không buff bạn ạ.

@Nghệ Mạt

#cua

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1. We are creating a housework schedule in our family. A housework ………………………………………………….2. Alzheimer’s disease affects our brain’s memory. Our brain’s …………………………………………………..3. Many people think organic food is just a waste of money. Organic food …………………………………………………………..…………4. They believe that John caught this cold form his brother yesterday. John...
Đọc tiếp

1. We are creating a housework schedule in our family.
 A housework ………………………………………………….
2. Alzheimer’s disease affects our brain’s memory.
 Our brain’s …………………………………………………..
3. Many people think organic food is just a waste of money.
 Organic food …………………………………………………………..…………
4. They believe that John caught this cold form his brother yesterday.
 John ……………………………………………………………………….……
5. He says that his family has reduced the amount of sugar in their diets.
 His family ……………………………………………………………………….……
6. They think that agricultural chemicals can cause serious illnesses like cancer.
 Agricultural chemicals …………………………………………………………….……

0
9 tháng 11 2021

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NM
9 tháng 11 2021

Gọi A,B,C là tập hợp các học sinh tích môn toán , Văn , Anh

ta có : 

\(\hept{\begin{cases}\left|A\right|=10,\left|B\right|=20,\left|C\right|=25\\\left|A\cap B\cap C\right|=3\\\left|A\cup B\cup C\right|=40\end{cases}}\) ta có : \(\left|A\cup B\cup C\right|=\left|A\right|+\left|B\right|+\left|C\right|-\left(\left|A\cap B\right|+\left|B\cap C\right|+\left|C\cap A\right|\right)+\left|A\cap B\cap C\right|\)

nên \(\left|A\cap B\right|+\left|B\cap C\right|+\left|C\cap A\right|=18\)

Do đó số học sinh chỉ thích đúng hai môn là  :

\(\left|A\cap B\right|+\left|B\cap C\right|+\left|C\cap A\right|-3\left|A\cap B\cap C\right|=18-3\times3=9\)

8 tháng 11 2021

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