Giúp minhf ma
Giúp mik bài VII nha minhf
GIÚP MINHF LM Ý C VÓI Ạ
\(P=\dfrac{x}{x-4}+\dfrac{1}{\sqrt{x}-2}+\dfrac{1}{\sqrt{x}+2}\left(x\ge0,x\ne4\right)\)
\(=\dfrac{x}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}+\dfrac{1}{\sqrt{x}-2}+\dfrac{1}{\sqrt{x}+2}\)
\(=\dfrac{x+\sqrt{x}+2+\sqrt{x}-2}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}=\dfrac{x+2\sqrt{x}}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}=\dfrac{\sqrt{x}\left(\sqrt{x}+2\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\)
\(=\dfrac{\sqrt{x}}{\sqrt{x}-2}\)
c) \(P=\dfrac{4}{3}\Rightarrow\dfrac{\sqrt{x}}{\sqrt{x}-2}=\dfrac{4}{3}\Rightarrow3\sqrt{x}=4\sqrt{x}-8\Rightarrow\sqrt{x}=8\Rightarrow x=64\)
các bạn làm nhanh giúp minhf với
Giải chi tiết giúp minhf ạ cần gấp
\(n_Fe=\dfrac{11,2}{56}=0,2(mol)\\ PTHH:Fe+2HCl\to FeCl_2+H_2\\ a,n_{H_2}=n_{Fe}=0,2(mol)\\ \Rightarrow V_{H_2(đktc)}=0,2.22,4=4,48(l)\\ b,n_{HCl}=2n_{Fe}=0,4(mol)\\ \Rightarrow m_{HCl}=0,4.36,5=14,6(g)\\ c,n_{FeCl_2}=n_{Fe}=0,2(mol)\\ \Rightarrow m_{FeCl_2}=0,2.127=25,4(g)\)
Giúp minhf với mình đang cần gấp.Cảm ơn ạ
a,\(P\left(x\right)=x^3-2x^4+x^5-\dfrac{1}{2}x^2+=x^5-2x^4+x^3-\dfrac{1}{2}x^2+1\)
bậc :5
b,\(Q\left(x\right)=-x^3+3x^2-5x^4-x^2+3x^3-\dfrac{1}{2}=-5x^4+2x^3+2x^2-\dfrac{1}{2}\)
bậc :4
b,\(P\left(x\right)-Q\left(x\right)=\left(x^5-2x^4+x^3-\dfrac{1}{2}x^2+1\right)-\left(-5x^4+2x^3+2x^2-\dfrac{1}{2}\right)\)
\(=\text{}\text{}\text{}\text{}x^5+3x^4-x^3-\dfrac{5}{2}x^2+\dfrac{3}{2}\)
a: Ta có: \(P\left(x\right)=x^3-2x^4+x^5-\dfrac{1}{2}x^2+1\)
\(=x^5-2x^4+x^3-\dfrac{1}{2}x^2+1\)
Bậc là 5
Ta có: \(Q\left(x\right)=-x^3+3x^2-5x^4-x^2+3x^3-\dfrac{1}{2}\)
\(=-5x^4+2x^3+2x^2-\dfrac{1}{2}\)
Bậc là 4
b: Ta có: P(x)-Q(x)
\(=x^5-2x^4+x^3-\dfrac{1}{2}x^2+1+5x^4-2x^3-2x^2+\dfrac{1}{2}\)
\(=x^5+3x^4-x^3-\dfrac{5}{2}x^2+\dfrac{3}{2}\)
Ai làm giúp minhf đến cậu 10 với ạ
Giúp minhf với !!đi mà 😥😥😥😥
mn giúp minhf vs ạ mình đang cần gấp
1. b
2. a
3. b
4. c
5. c
6. a
7. c
8. b
9. a
10. a
11. b
12. c
13. a
Giúp mình với làm ơn minhf
cần nộp trong hôm nay
Part 1:
1. Life in my village is quiet and exciting.
2. It is more expensive than I expected.
3. Which one is smaller, Da Nang or Nha Trang?
4. Ho Chi Minh City is more crowded than Lam Dong.
5. Which place would she like to live, Ha Noi or Hue?
Part 2:
6. Which one is noisier, life in the city or life in the countryside?
7. Which place would you like to visit, Trang Tien Bridge or Thien Mu Pagoda?
8. What does she think of The City Theatre?
9. He'd like to visit to Hoa Lu temple
10. Life in Da Nang is more expensive than life in Ho Chi Minh City.