$(x+3)(x-3)-(x+1)^2=0$
$⇔ x^2-9-(x^2+2x+1)=0$
$⇔ x^2-9-x^2-2x-1=0$
$⇔ -2x-10=0$
$⇔ -2x=10$
$⇔ x=-5$
Vậy $S=\{-5\}$
Đáp án + Giải thích các bước giải:
`(x+3)(x-3)-(x+1)^{2}=0`
`<=>x^{2}-9-(x^{2}+2x+1)=0`
`<=>x^{2}-9-x^{2}-2x-1=0`
`<=>-2x-10=0`
`<=>-2x=10`
`<=>x=-5`
Vậy `S={-5}`
Mn giúp mình giải mấy bài này với . Giải nhanh giúp mình
Help em,cần gấp ạ Cho tam giác ABC có AB < AC. Trên tia đối của tia BC lấy điểm M sao cho BM = BA. Trên tia đối của tia CB lấy điểm N sao cho CN = CA.
giải hộ mình câu 8 nha chi tiết thank các bạn
Cali: Lệ Minh Tone sáng, NL: đẹp đẹp zô, lớp trưởng đóo
ai cho mik bài hát nào buồn buồn đc ko,mik nghe thử mà hay cho bn 5 sao luôn
Exercise: Rearrange the words to make sentences 1. toothache/ because/ You/ too/ you/ much/ have/ candy./ eat 2. we/ so/ more/ I/ can/ free/ on/ have/ Sunday,/ time/ the/ go/ zoo./ to 3. fast/ should/ food./ You/ less/ eat 4. going/ my/ to/ but/ going. /am/ Today/ I/ brother/ school/ isn’t 5. a bike/ riding/ and/ running/ such as/ Sports,/ a lot of/ need/ calories. 6. eats/ wants/ My/ she/ to/ healthier,/ and/ be/ mom/ fruits/ more/ vegetables./ so 7. home/ it’s/ You/ outside./ should/ because/ cold/ come/ early/ back 8. so/ early./ I/ be/ tomorrow/ want/ should/ to/ tired/ bed/ don’t/ I/ go/ to 9. has/ try/ because/ Mai/ to/ less/ a/ to/ sore throat./ has/ talk/ she 10. bed/ if/ harmful/ you/ late./ It’s/ to/ body/ go/ your/ to
liên hệ những tác động tích cực,tiêu cực của cuộc cách mạng khoa học kĩ thuật đến địa phương em đang sống,từ đó hãy tìm biện pháp khăc phục
cảm nhận đoạn thơ ''Kiều ở lầu Ngưng Bích'' sau từ đó nhận xét về Gía Trị nhân đạo trong ngòi bút Nguyễn du Trích đoạn như sau: ''Từ đầu đến Đã vừa người ôm'' mn giúp mình vs 15p nx học r yêu mn>>>
Nêu khái niệm về ngành ruột khoang
XIII.Read the text carefully, then answer the questions. Many people enjoy living in a big city because they think life is more exciting there. However, I come from a small village and in my view, there are lots of benefits. The main reason I prefer village life is because it’s very quiet, so I always feel calm when I’m here. Another reason is that the air is so fresh and clean. We have more green spaces and bigger gardens, too. In addition, I think the people here are friendlier. Personally, I’m interested in wildlife photography, so the countryside is perfect for me. The only downside is transport. I have an early start for a long Journey to school in Faro and the school bus is always stopping to pick up more people. Also, it’s boring sometimes, but I enjoy chatting to my friends. Fortunately, I’m learning to ride a moped. On balance, I disagree that city life is better, as I think my village lifestyle is healthier and more relaxing. In spite of that, some of my friends couldn’t cope with life in the country, so it comes down to personal opinion. 1. Where does the writer come from? 2. Does he like living in a big city? 3. Why does he prefer village life? 4. How does he think about the people in his village? 5. According to the writer, what is the disadvantage of living in the village?
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến