Ai giúp vs cần ggasp
Giúp mik câu d vs bài 4, mik cần gấp, mong ai đg thức giúp mik vs ạ
Câu 3:
a: Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:
\(\dfrac{x}{3}=\dfrac{y}{2}=\dfrac{x+y}{3+2}=\dfrac{90}{5}=18\)
Do đó: x=54; y=36
Ai giúp vs cần gấp
Mình cần gấp ai giúp vs
$a)2Mg+O_2\xrightarrow{t^o}2MgO$
$b)4P+5O_2\xrightarrow{t^o}2P_2O_5$
$c)4Al+3O_2\xrightarrow{t^o}2Al_2O_3$
$d)2Na+S\xrightarrow{t^o}Na_2S$
$e)2H_2O\xrightarrow{đp}2H_2+O_2$
$f)2KClO_3\xrightarrow{t^o,MnO_2}2KCl+3O_2$
$g)Cu+Cl_2\xrightarrow{t^o}CuCl_2$
$h)2KMnO_4\xrightarrow{t^o}K_2MnO_4+MnO_2+O_2$
$i)Mg+2HCl\to MgCl_2+H_2$
$j)2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2$
$k)H_2+CuO\xrightarrow{t^o}Cu+H_2O$
$l)CaO+H_2O\to Ca(OH)_2$
Hóa hợp: $a,b,c,d,g,l$
Phân hủy: $e,f,h$
Thế: $i,j,k$
ai lm Giúp vs cần gấp ạ
ai giúp mình vs! mình cần gấp
\(1,A=\left(\dfrac{\sqrt{x}}{\sqrt{x}-1}-\dfrac{1}{x-\sqrt{x}}\right):\left(\dfrac{1}{\sqrt{x}+1}+\dfrac{2}{x-1}\right)\left(x>0;x\ne1;x\right)\\ A=\dfrac{x-1}{\sqrt{x}\left(\sqrt{x}-1\right)}:\dfrac{\sqrt{x}-1+2}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\\ A=\dfrac{\sqrt{x}+1}{\sqrt{x}}\cdot\left(\sqrt{x}-1\right)=\dfrac{x-1}{\sqrt{x}}\)
\(2,x=2\sqrt{2}+3=\left(\sqrt{2}+1\right)^2\\ \Leftrightarrow A=\dfrac{2\sqrt{2}+3}{\sqrt{2}+1}=\dfrac{\left(2\sqrt{2}+3\right)\left(\sqrt{2}-1\right)}{1}\\ =4\sqrt{2}-2\sqrt{2}+3\sqrt{2}-3=5\sqrt{2}-3\)
ai giúp mình vs! mình cần gấp
ai giúp mik vs mik cần gấp
1. Where is the teacher right now?
2. Where is Dr Green staying?
3. How do you get to your new office?
4. What do the contruction workers do in the park?
5. When does she leave for work?
6. Where did he go yesterday?
7. Who will she have dinner with tomorrow night?
8. Why will she sleep in her sofa?
9. Who are studying C in the laboratory?
10. How long does it take you to go to school?
ai giúp vs mình đang cần gấp
Ai giúp mik vs ạ,mik cần gấp
1,\(\sqrt{\left(x-1\right)^2}=\left|x-1\right|=-\left(x-1\right)=1-x\)
2,\(\sqrt{\left(a-2b\right)^2}=\left|a-2b\right|=-\left(a-2b\right)=2b-a\)
3,\(\sqrt{\left(2x-1\right)^2}=\left|2x-1\right|=2x-1\)