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Chunbey Lonki
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༺ミ𝒮σɱєσиє...彡༻
14 tháng 12 2021 lúc 14:33

\(PTK_{Cu\left(OH\right)_2}=64+\left(16+1\right).2=98\left(đvC\right)\)

\(\%m_{Cu}=\dfrac{64}{98}.100=65,30\%\)

\(\%m_O=\dfrac{16.2}{98}.100=32,65\%\)

\(\%m_H=\dfrac{1.2}{98}.100=2,04\%\)

\(PTK_{H_2SO_4}=2.1+32+4.16=98\left(đvC\right)\)

\(\%m_H=\dfrac{2.1}{98}.100=2,04\%\)

\(\%m_S=\dfrac{32}{98}.100=32,65\%\)

\(\%m_O=\dfrac{4.16}{98}.100=65,30\%\)

các ý còn lại làm tương tự

Linh Lê
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Pham Minh Tue
11 tháng 1 2023 lúc 22:12

I love to imagine.It is quite fun.I don't really like the way my school is now,so I have an idea about my dream school.My dream school will be pretty llarge.It will be just like a town.Here,students will be like sisters or brothers.They will share and help each other.My dream school will also have teachers,but they won't teach us difficult things much.Instead,they will do exercises,have fun with students.My dream school won't use notebooks or books,because ipads and computers will be used much.We can learn more and play in freetime.The playground will have:slides,swings,...like other regular schools.Just a bit odd by having dancing floor,karaoke rooms,...It sound fun,isn't it.I like my dream school,alot.

AVĐ md roblox
12 tháng 1 2023 lúc 11:02

TK :

Hello. Today, I will talk about my dream school. When my child was in elementary school I always wanted to go to a modern school. I watch movies and I see a lot of modern and convenient schools. The school has many classes. Specialized subjects will have their own rooms. The school will have vending machines. My school will have a gym room. We will have healthy sports such as basketball, badminton, … the campus will be planted with flowers and trees. What is your dream school? Please share to let me know!

Cherry
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Dang Khoa ~xh
30 tháng 9 2021 lúc 11:47

1. bag

2. bunch

3. slice

4. box

5. piece

6. carton

7. can

8. bowl

9. jar

10. bottle

Thuý vân
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Mến Nguyễn
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Đỗ Tiến Dũng
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Nguyễn An
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Dương Ngọc Nguyễn
6 tháng 7 2021 lúc 11:09

Bạn nên đăng những câu khó nhất hoặc bạn lọc ra những câu tương tự nhau để bản thân có thể vận dụng nhé!

Noname
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Akai Haruma
29 tháng 12 2023 lúc 23:02

Bài 1:

a. $-27+(-154)-(-27)+54$

$=(-27)-(-27)+(-154)+54=0-154+54=0-(154-54)=0-100=-100$

b.

$-35.127+(-35).(-27)+700$

$=(-35)(127-27)+700=-35.100+700=-3500+700=-2800$

c.

$-3^4-2[(-2023)^0+(-5)^2]=-81-2(1+25)=-81-2.26=-81-52$

$=-(81+52)=-133$

Akai Haruma
29 tháng 12 2023 lúc 23:04

Bài 2: 

a. $-34-2(7-x)=-10$

$2(7-x)=-34-(-10)=-24$

$7-x=-24:2=-12$

$x=7-(-12)=19$
b.

$x=ƯC(36,54,90)$

$\Rightarrow ƯCLN(36,54,90)\vdots x$

$\Rightarrow 18\vdots x$

$\Rightarrow x\in \left\{\pm 1; \pm 2; \pm 3; \pm 6; \pm 9; \pm 18\right\}$

Mà $x>5$ nên $x\in \left\{6; 9; 18\right\}$

Nguyễn Khả Hân
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