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Giải thích các bước giải:
$\sqrt{11x+3}$`-`$\sqrt{x+1}$`=4`$\sqrt{2x-5}$
`⇔(`$\sqrt{11x+3}$`-`$\sqrt{x+1}$`)^2=16`$\sqrt{2x-5}$²
`⇔11x+3-2`$\sqrt{11x²+11x+3x+3}$`+x+1=16(2x-5)`
`⇔11x+3+x+1-32x+80=2√(x+1)(11x+3)`
`⇔-20x+84=2√(x+1)(11x+3)`
`⇔-10x+42=√(x+1)(11x+3)`
`⇔100x²-840x+1764=11x²+11x+3x+3` Đk:x≤4,2
`⇔89x²-854x+1761=0`
`⇔89x²-267x-587x+1761=0`
`⇔89x(x-3)-587(x-3)=0`
`⇔(x-3)(89x-587)=0`
`⇔x=3` hoặc `x=587/89`(loại
Mn ơi giúp mik vs ạ mik cảm ơn mn
Yêu cầu: Vẽ hình, làm bài, giải thích chi tiết
1. What is __________ (long) river in Vietnam? 2. This was ______ big farm I've ever visited.
1. My teacher (have).................. long hair. A. haveB. hasC. have had D.had 2. They (not want )………to play the love games, but they (play)…...…..now. A. isn't want, playsB. doesn't want, plays C. not want, are playing D.don’t want, are playing 3. ............. Marry (be) an English person? - Yes, she (speak)............…….English at the meeting right now. A. Be, speaks B.Are, is speaking C. Is, is speakingD. Is, are speaking 4. Look! The man (climb)……..up the tree. A. is climbingB. climbs C. are climbingD. climb 5. A:How often does John (go)………… to the library? B: - No, he (not like)………….to read books. He only (want)…..……..to listen to music. A: What he (do)………..at the moment? A. go, doesn’t like, wants, does he do B. go, don’t like, wants, is he doing C. go, doesn’t like, wants, is he doing D. go, doesn’t like, want, is he doing
toan M= 3a^2 ( -2a^2 - 2a -1/3 ) ( -a - 3 ) tại a = -2
Ai giúp mình câu 18 với câu 21 với ạ
Water pollution can (1)_____ dramatic effects. In many poor nations, there are frequent outbreaks of cholera and other diseases (2)_____ of people drinking untreated water. Humans can even die if they drink contaminated water. Polluted water also causes the (3)_____ of aquatic animals such as fish, crabs, orbirds. Other animals eat these dead animals and may also get sick. In addition, herbicides in water can kill aquatic plants and cause further damage to the (4)______. 4. A. soil B. air C. noise D. environment
Mn ơi giúp mik vs ạ mik đg cần ạ
Choose the best answer A, B, C or D to complete the sentence. I would give much more help to the victims of the pandemic if I _______a president. C. was D. were A. to be B. am
trả lời hộ tôi với cảm ơnnnnnnnnnn
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