a)
`4x^2-9=0`
`<=>(2x-3)(2x+3)=0`
`<=>` \(\left[ \begin{array}{l}2x-3=0\\2x+3=0\end{array} \right.\) `<=>` \(\left[ \begin{array}{l}2x=3\\2x=-3\end{array} \right.\) `<=>` \(\left[ \begin{array}{l}x=\frac{3}{2}\\x=\frac{-3}{2}\end{array} \right.\)
vậy `S={3/2;-3/2}`
b)
`x^3+3x=3x^2+1`
`<=> x^3-3x^2+3x-1=0`
`<=>(x-1)^3=0`
`=>x-1=0`
`<=>x=1`
vậy `S={1}`
a) `4x^2-9=0`
⇔`(2x-3)(2x+3)=0`
⇔\(\left[ \begin{array}{l}2x-3=0\\2x+3=0\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=\frac{3}{2}\\x=-\frac{3}{2}\end{array} \right.\)
Vậy `S={3/2,-3/2}`
b) `x^3+3x=3x^2+1`
⇔`x^3+3x-3x^2-1=0`
⇔`(x-1)^3=0`
⇔`x-1=0`
⇔`x=1`
Vậy `S={1}`
Vai trò của P trong cấu trúc và cơ chế di truyền được thể hiện như thế nào?
Giải giúp mk câu 49 này với ạ mk cảm ơn
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Tại sao ADN có kích thước lớn nhưng vẫn được xếp gọn trong nhân tế bào? Sự sắp xếp đó như thế nào? Và có ảnh hưởng khả năng tiếp xúc ADN với Protein không?
1. Bondi is the beautiful beach. I used to sunbathe there. A. Bondi is the beautiful beach where I used to sunbathe. B. Bondi is the beautiful beach where I used to sunbathe there. C Bondi is the beautiful beach which I used to sunbathe. B. Bondi is the beautiful beach in where I used to sunbathe. 2. I don’t know the reason. He didn’t come to school yesterday. A. I don’t know the reason why didn’t come to school yesterday. B. I don’t know the reason why didn’t come to school yesterday. C. I don’t know the reason which he didn’t come to school yesterday. D. The reason why he didn’t come to school yesterday I don’t know. 3. The town is noisy and crowded. We are living in this town. A. The town is noisy and crowded where we are living. B. The town where we are living in this town is noisy and crowded. C. The town which we are living is noisy and crowded. D. The town where we are living is noisy and crowded 4. The picture reminds him of the time. He studied in New York at that time. A. The picture reminds him of the time when he studied in New York at that time. B. The picture reminds him of the time when he studied in New York. C. The picture reminds him of the time where he studied in New York. D. The picture reminds him of the time which he studied in New York. 5. The girl and her dog are living next to our house. You saw them yesterday. A. The girl and her dog which you saw yesterday are living next to our house. B. The girl and her dog who you saw yesterday are living next to our house. C. The girl and her dog that you saw yesterday are living next to our house. D. The girl and her dog that you saw them yesterday are living next to our house. 6. March 1st is the day. The astronaut will come and give a speech at our school then. A. March 1st is the day when the astronaut will come and give a speech at our school. B. March 1st is the day when the astronaut will come and give a speech at our school then. C. March 1st is the day where the astronaut will come and give a speech at our school. D. March 1st is the day which the astronaut will come and give a speech at our school. 7. They are looking for the man and his dog. They have lost the way in the forest. A. They're looking for the man and his dog which have lost the way in the forest. B. They're looking for the man and his dog who have lost the way in the forest. C. They're looking for the man and his dog that they have lost the way in the forest. D. They're looking for the man and his dog that have lost the way in the forest
Giúp em với ạ em cảm ơn nhiều ạ
Bài 1 cho a-b+c-d=0 CMR a^3-b^3+c^3-d^3=3(c-d)(cd-ab)
Kể lại một kỉ niệm đáng nhớ Tả cảnh mùa hè trên quê hương em (Ghi vở nhé)
Vẽ đậu mầm cute nhoa :3 Nl : Hóng :))
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