Đáp án+Giải thích các bước giải:
`a) 2 - 25x^2 = 0`
`⇔ 25x^2 = 2 - 0`
`⇔ 25x^2 = 2`
`⇔ x^2 = 2/25`
`⇔` $\frac{√2}{5}$ `hoặc` $\frac{-√2}{5}$
`b) x^2-x+1/4=0`
`⇔ (x-1/2)^2 = 0`
`⇔ x - 1/2 = 0`
`⇔ x = 0+1/2`
`⇔ x = 1/2`
`a)2-25x^2=0`
`<=>(\sqrt{2}-5x)(\sqrt{2}+5x)=0`
`<=>\sqrt{2}-5x=0` hoặc `\sqrt{2}+5x=0`
`<=>x=\frac{\sqrt{2}}{5}` hoặc `x=\frac{-\sqrt{2}}{5}`
`b)x^2-x+1/4=0`
`<=>x^2-2.x. 1/2 +(1/2)^2=0`
`<=>(x-1/2)^2=0`
`<=>x-1/2=0`
`<=>x=1/2`
Ai giúp em câu này với ạ please
E2.Choose the correct answer. 1. If you read more, your vocabulary will be -------------- every day. A. good B. well C. better D. best 2. It is wrong of you to do this. This -----------------never happen again A. does B. would C. will D. must 3. “--------------------------------“? “He is of medium height, with black hair and dark skin” A. What is your new friend like? B. What does your new friend look like? C. How is your new friend? D. What does your new friend like ? 4. “-------------------------do you play table tennis? – Once a week A. How much B. How long C. How for D. How often 5. Trung wants to become a musician. He thinks it is the -------------job in the world. A. good B. more good C better D. best 6. There are too many buildings------------this city. A. in B. at C. with D. on 7. Excuse me, I’m looking for a telephone box”. “There ‘s one---------------------” A. straight B. at the corner of the street C. turn right D. going left 8. My parents always say that I --------take things without asking. A. needn’t B. mayn’t C. shouldn’t D. won’t 9. “Would you like me turn off your computer?” “-------------. I ‘ll do it myself.” A. No, thanks B. Yes, please C. Don’t do it D. Of course 10. Phuong is very good ________ English and History, but she doesn’t like Maths much. A. with B. for C. to D. at
Cho 4 tb sinh tinh có KG AaBbDd tham gia GP ko đột biến tạo giao tử có tỷ lệ phân ly như thế nào? Help
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ai giúp mình 4 bài này với ạ cảm ơn mọi người ( 40 điểm )
giúp mình rút gọn 2 biểu thức này với cảm ơn
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Giải giùm em vs ạ tiếng anh lớp 7
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