$\text{Đáp án+Giải thích các bước giải:}$
`(x+2)²=(2x-1)²`
`⇔(x+2)²-(2x-1)²=0`
`⇔(x+2-2x+1)(x+2+2x-1)=0`
`⇔ (3-x)(1+3x)=0`
`⇔ x=3;(-1)/3`
`b) (x+2)²-x+4=0`
`⇒ x²+4x+4-x+4=0`
`⇔ x²+3x+8=0`
Mà `x²+3x+8>0 ⇒` Vô nghiệm
`c) (x-3)³-(x-3)(x²+3x+9)+9(x+1)²=15`
`⇔ (x-3)³-x³+3³+9(x+1)²=15`
`⇔ x³-9x²+27x-27-x³+27+9x²+18x+9=15`
`⇔ 45x=6`
`⇔ x=6/45`
`e)(x+2)²=(2x-1)²`
`⇔x²+4x+4=4x²-4x+1`
`⇔3x²-8x-3=0`
`⇔3x²+x-9x-3=0`
`⇔x(3x+1)-3(3x+1)=0`
`⇔(3x+1)(x-3)=0`
`⇔3x+1=0` hoặc `x-3=0`
`⇔x=-1/3` hoặc `x=3`
`f)(x+2)²-x+4=0`
`⇔x²+4x+4-x+4=0`
`⇔x²+3x+8=0`(vô nghĩa)
`g)(x-3)³-(x-3)(x²+3x+9)+9(x+1)²=15`
`⇔x³-9x²+27x-27-x³+27+9x²+18x+9-15=0`
`⇔45x-6=0`
`⇔3(15x-2)=0`
`⇔15x-2=0`
`⇔x=2/15`
Vẽ anime or chibi hoang mang NL: ai hiểu rì hơm thì kể tuii nghe đuy `↓ ↓ ↓`
Làm và dịch bài luoon nha mọi người
Một hợp chất A có chứa 53,3% oxi về khối lượng còn lại là silic. Xác định công thức hóa học của hợp chất A
Mark the letter A, B, C or D to indicate the sentence that is closest in meaning to each of the following questions. 36. If I was in your shoe, I would let him go. A. My suggestion is that you let him go. B. My advice is that you wear your shoes and let him go. C. I would like to be in your shoe so you could let him go. D. I was wearing your shoes and would like to let him go. 37. I haven’t seen my aunt since the Covid-19 began in 2019. A. I last saw my aunt before the beginning of the Covid-19. B. My aunt left the country after the Covid-19 so didn’t see her. C. I haven’t seen my aunt for so many years because of the Covid-19. D. My aunt didn’t come back until the start of the Covid-19 in 2019. 38. We must take care of all living species on Earth. A. All living species on Earth are taken care of by us. B. All living species on Earth must be taken care of by us. C. All living species on Earth had been taken care of by us. D. All living species on Earth will be taken care of by us. 39. Many people came to the meeting. Some were half an hour late. A. Many people came to the meeting, some of who were half an hour late. B. Many people came to the meeting, some of whom were half an hour late. C. Many people came to the meeting, but some of them were half an hour late. D. Many people who came to the meeting some of them were half an hour late. 40. "Be careful when you cross the road, won’t you?" A. He says I will be careful when I cross the road. B. He asked me if I would be careful when I crossed the road. C. He told me to cross the road only when I was careful. D. He warned me to be careful when I crossed the road.
Giúp mik với mik đang cần gấp .
nhanh=ctlhn thế thui VI. Choose the word (a, b, c, or d) that best fits each of the blank spaces. ( 1,5 ms) 17 This composition is about my aunt’s (1) in Florida last year. She hired a car at Miami (2)…….. , and soon (3) lost. So, she stopped to ask a young man how to get to the hotel. Unfortunately, the young man had a gun; he made my aunt get (4)………… of the car, and she had to give him all her money. Luckily, a police car drove past a few minutes later and (5) Then, the police arrested the thief and got my aunt’s money back. (6)…….. the end, my aunt had quite a good holiday, but she said that she was happy to get back home. 1. A. holiday B. vacation C. festival D. a & b 2. A. airport B. airway C. airplane D. airstrip 3. A. took B. had C. got D. caught 4. A. in B. out C. inside D. outside 5. A. picked her up B. picked up her C. showed her around D. showed around her 6. A. In B. At C. On D. When
Giúp vs ạ ai giúp cho 5 sao uy tín
giúp mình với mình cần gấp ạ. mình sẽ vote 5 sao
TÌM X: 5x - 7 = 50 vote câu tl này hộ mình, đc hơn 100 vote rồi, thanks các bn nhiều https://hoidap247.com/cau-hoi/2176915
giúp e với ạ e hứa vote 5 sao nhớ kèm giải thích nữa ak
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
