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điều kiện loại1, câuloại 2, loại 3.(mình đang cần gấp giúp mình với mình cảm ơn trước ạ)cau1:If you don't try your best,you the next exam. A:will fail. B:fails. C:would come. D:would have come.cau2:If each person one more tree,the pollution problem worldwide would be solved.A:plants. B:planted. C:had planted. D:will plant.cau3:If our teacher were here now,he us with this difficult exercise.A:has helped. B:helps. C:will help. D:would help.cau4:If anyone ,please tell...
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điều kiện loại1, câuloại 2, loại 3.(mình đang cần gấp giúp mình với mình cảm ơn trước ạ)

cau1:If you don't try your best,you the next exam. A:will fail. B:fails. C:would come. D:would have come.

cau2:If each person one more tree,the pollution problem worldwide would be solved.

A:plants. B:planted. C:had planted. D:will plant.

cau3:If our teacher were here now,he us with this difficult exercise.

A:has helped. B:helps. C:will help. D:would help.

cau4:If anyone ,please tell them I'm not at work today.

A:will call. B:should call. C:called. D:calls.

cau5:If you an important decision,you will think carefully.

A:work. B:make. C:expect. D:do.

cau6:You'll get pneumonia you your wet clothes.

A:should-not change. B:don't-change. C:were-not to change. D:had you not changed.

cau7::she able to walk faster If her shoes didn't have such high heels.

A:could be. B:couldn't be. C:were. D:had been.

cau8:I things on the installment system if I were you.

A:wouldn't buy. B:don't buy. C:won't buy. D: wouldn't have bought.

cau9:If anyone attacks me, my dear dog at his throat.

A:would bite. B:will bite. C:bit. D:had bitten.

cau10:I'll pay you double if you the work finished by friday.

A:get. B:got. C: had got. D:are getting.

cau11:had I know that you were in hospital,I you. A:would visit. B:will visit. C:would have visited. D: visit.

cau12:you won't make better progress unless you class regulary. A:attend. B:attended. C:don't attend. D:didn't attend.

cau13:If you ten minutes earlier,you would have a seat in the auditorium. A:arrive. B:arrived. C:had arived. D:arrives.

cau14:If he hard,he the coming exam.

A:stidied/would pass. B:doesn't study/ will surely pass.

C:studies/can pass. D:hadn't studied/wouldn't have passed.

cau15:If she asked you for hep, ?

A:would you accept. B:you accept. C:will you accept. D:do you accept.

2
3 tháng 8 2021

cau1:If you don't try your best,you the next exam. A:will fail. B:fails. C:would come. D:would have come.

cau2:If each person one more tree,the pollution problem worldwide would be solved.

A:plants. B:planted. C:had planted. D:will plant.

cau3:If our teacher were here now,he us with this difficult exercise.

A:has helped. B:helps. C:will help. D:would help.

cau4:If anyone ,please tell them I'm not at work today.

A:will call. B:should call. C:called. D:calls.

cau5:If you an important decision,you will think carefully.

A:work. B:make. C:expect. D:do.

cau6:You'll get pneumonia you your wet clothes.

A:should-not change. B:don't-change. C:were-not to change. D:had you not changed.

cau7::she able to walk faster If her shoes didn't have such high heels.

A:could be. B:couldn't be. C:were. D:had been.

cau8:I things on the installment system if I were you.

A:wouldn't buy. B:don't buy. C:won't buy. D: wouldn't have bought.

cau9:If anyone attacks me, my dear dog at his throat.

A:would bite. B:will bite. C:bit. D:had bitten.

cau10:I'll pay you double if you the work finished by friday.

A:get. B:got. C: had got. D:are getting.

cau11:had I known that you were in hospital,I you. A:would visit. B:will visit. C:would have visited. D: visit.

cau12:you won't make better progress unless you class regulary. A:attend. B:attended. C:don't attend. D:didn't attend.

cau13:If you ten minutes earlier,you would have a seat in the auditorium. A:arrive. B:arrived. C:had arived. D:arrives.

cau14:If he hard,he the coming exam.

A:stidied/would pass. B:doesn't study/ will surely pass.

C:studies/can pass. D:hadn't studied/wouldn't have passed.

cau15:If she asked you for hep, ?

A:would you accept. B:you accept. C:will you accept. D:do you accept.

3 tháng 8 2021

cau1:If you don't try your best,you the next exam. A:will fail. B:fails. C:would come. D:would have come.

cau2:If each person one more tree,the pollution problem worldwide would be solved.

A:plants. B:planted. C:had planted. D:will plant.

cau3:If our teacher were here now,he us with this difficult exercise.

A:has helped. B:helps. C:will help. D:would help.

cau4:If anyone ,please tell them I'm not at work today.

A:will call. B:should call. C:called. D:calls.

cau5:If you an important decision,you will think carefully.

A:work. B:make. C:expect. D:do.

cau6:You'll get pneumonia you your wet clothes.

A:should-not change. B:don't-change. C:were-not to change. D:had you not changed.

cau7::she able to walk faster If her shoes didn't have such high heels.

A:could be. B:couldn't be. C:were. D:had been.

cau8:I things on the installment system if I were you.

A:wouldn't buy. B:don't buy. C:won't buy. D: wouldn't have bought.

cau9:If anyone attacks me, my dear dog at his throat.

A:would bite. B:will bite. C:bit. D:had bitten.

cau10:I'll pay you double if you the work finished by friday.

A:get. B:got. C: had got. D:are getting.

cau11:had I know that you were in hospital,I you. A:would visit. B:will visit. C:would have visited. D: visit.

cau12:you won't make better progress unless you class regulary. A:attend. B:attended. C:don't attend. D:didn't attend.

cau13:If you ten minutes earlier,you would have a seat in the auditorium. A:arrive. B:arrived. C:had arived. D:arrives.

cau14:If he hard,he the coming exam.

A:stidied/would pass. B:doesn't study/ will surely pass.

C:studies/can pass. D:hadn't studied/wouldn't have passed.

cau15:If she asked you for hep, ?

A:would you accept. B:you accept. C:will you accept. D:do you accept.

26 tháng 2 2022

ko có ảnh bn ơi

26 tháng 2 2022

Đề bài là gì zạ? lolang

10 tháng 8 2021

PTHH: Al2O3+6HCl➝2AlCl3+3H2O(1)

a)nAl2O3=\(\dfrac{10,2}{102}\)=0,1(mol)

   mHCl=\(\dfrac{5\%.219}{100\%}\)=10,95(g)

   ⇒nHCl=\(\dfrac{10,95}{36,5}\)=0,3(mol)

Xét tỉ lệ Al2O3:\(\dfrac{0,1}{1}\)=0,1

Xét tỉ lệ HCl:\(\dfrac{0,3}{6}\)=0,05

⇒HCl pứng hết,Al2O3 còn dư

Theo PTHH(1) ta có nAl2O3 pứng=\(\dfrac{nHCl}{6}\)=\(\dfrac{0,3}{6}\)=0,05(mol)

⇒nAl2O3 dư=nAl2O3ban đầu-nAl2O3 pứng=0,1-0,05=0,05(mol)

⇒mAl2O3 dư=0,05.102=5,1(g)

b) C%HCl=\(\dfrac{0,3.36,5}{219+10,2}\).100%=4,8%

     nAlCl3=0,1(mol)

⇒C%AlCl3=\(\dfrac{0,1.136,5}{10,2+219}\).100%=6%

 

b: Tọa độ giao điểm là:

\(\left\{{}\begin{matrix}2x+1=x-2\\y=x-2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-3\\y=-5\end{matrix}\right.\)

8 tháng 10 2021

Đề bài đây ạ 

8 tháng 10 2021

undefined

a: \(f\left(x\right)+g\left(x\right)=x^3-3x^2+6x-8+x^3-6x^2+12x-8\)

\(=2x^3-9x^2+18x-16\)

b: \(f\left(1\right)=1^3-3\cdot1^2+6\cdot1-8=1-3+6-8=-2+6-8=4-8=-4\)

\(g\left(-1\right)=-6\cdot\left(-1\right)^2+\left(-1\right)^3-8+12\cdot\left(-1\right)\)

\(=-6\cdot1-1-8-12\)

=-6-21

=-27

c: f(x)-g(x)=0

=>f(x)=g(x)

\(\Leftrightarrow x^3-3x^2+6x-8=x^3-6x^2+12x-8\)

\(\Leftrightarrow3x^2-6x=0\)

=>3x(x-2)=0

=>x=0 hoặc x=2

Bài 7:

Đặt f(x)=a; g(x)=b

Theo đề, ta có: \(\left\{{}\begin{matrix}a+b=5x^2-2x+3\\a-b=x^2-2x+5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2a=6x^2-4x+8\\a-b=x^2-2x+5\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}f\left(x\right)=3x^2-2x+4\\g\left(x\right)=3x^2-2x+4-x^2+2x-5=2x^2-1\end{matrix}\right.\)

26 tháng 2 2022

Mình cảm ơn nhiều nha ^^. Mà bạn có làm đc bài 3,6 ko ạ, giúp mình với 

29 tháng 10 2021

c) \(\dfrac{\sqrt{x}-1}{3}\left(\dfrac{\sqrt{x}+1}{\sqrt{x}-2}-\dfrac{\sqrt{x}+2}{\sqrt{x}-1}\right)\)

\(=\dfrac{\sqrt{x}-1}{3}.\dfrac{\sqrt{x}+1}{\sqrt{x}-2}-\dfrac{\sqrt{x}-1}{3}.\dfrac{\sqrt{x}+2}{\sqrt{x}-1}\)

\(=\dfrac{x-1}{3\left(\sqrt{x}-2\right)}-\dfrac{\sqrt{x}+2}{3}\)

\(=\dfrac{x-1}{3\left(\sqrt{x}-2\right)}-\dfrac{\left(\sqrt{x}+2\right)\left(\sqrt{x}-2\right)}{3\left(\sqrt{x}-2\right)}\)

\(=\dfrac{x-1}{3\left(\sqrt{x}-2\right)}-\dfrac{x-4}{3\left(\sqrt{x}-2\right)}\)

\(=\dfrac{x-1-x+4}{3\left(\sqrt{x}-2\right)}\)

\(=\dfrac{3}{3\left(\sqrt{x}-2\right)}\)

\(=\dfrac{1}{\sqrt{x}-2}\)

29 tháng 10 2021

bt trong dấu ngoặc bn nhân lên hợp ⇒ rút gọn ⇒ nhân với bt ngoài dấu ngoặc ⇒ rút gọn thôi á

mk gợi ý vậy thôi nha, chứ h giải ra thì lâu lắm=((

chúc bn làm bài tốt nka^3^

16 tháng 2 2022

1.B 2.C nha

16 tháng 2 2022

B

C

2 tháng 8 2021

d) Gọi x,y lần lượt là số mol Al, Fe

\(\left\{{}\begin{matrix}27x+56y=8,3\\1,5x+y=0,25\end{matrix}\right.\)

=> x=0,1 ; y=0,1

Kết tủa : Al(OH)3, Fe(OH)2 

Bảo toàn nguyên tố Al: \(n_{Al\left(OH\right)_3}=n_{Al}=0,1\left(mol\right)\)

Bảo toàn nguyên tố Fe: \(n_{Fe\left(OH\right)_2}=n_{Fe}=0,1\left(mol\right)\)

=> \(m=0,1.78+0,1.90=16,8\left(g\right)\)

Nung kết tủa thu được chất rắn : Al2O3 và FeO

Bảo toàn nguyên tố Al: \(n_{Al_2O_3}.2=n_{Al}\Rightarrow n_{Al_2O_3}=0,05\left(mol\right)\)

Bảo toàn nguyên tố Fe: \(n_{FeO}=n_{Fe}=0,1\left(mol\right)\)

=> \(a=0,05.102+0,1.72=12,3\left(g\right)\)