-0-135= bao nhiêu mọi ngưới
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17 tháng 12 2021
Gọi số mol Al, Zn là a,b
=> 27a + 65b = 11,9
\(n_{NO_2}=\dfrac{17,92}{22,4}=0,8\left(mol\right)\)
PTHH: Al + 6HNO3 --> Al(NO3)3 + 3NO2 + 3H2O
_____a---------------------------------->3a
Zn + 4HNO3 --> Zn(NO3)2 + 2NO2 + 2H2O
b------------------------------------>2b
=> 3a + 2b = \(\dfrac{17,92}{22,4}=0,8\)
=> a = 0,2 , b = 0,1
\(\left\{{}\begin{matrix}\%Al=\dfrac{0,2.27}{11,9}.100\%=45,378\%\\\%Zn=\dfrac{0,1.65}{11,9}.100\%=54,622\%\end{matrix}\right.\)
KV
23 tháng 12 2023
Số tiền lãi:
447500 - 358000 = 89500 (đồng)
Số phần trăm lãi:
89500 × 100% : 358000 = 25%
6 tháng 9 2017
Số vải còn lại sau khi bán lần 1 là :
\(24\div\left(1-\frac{3}{7}\right)=42\)( m )
Tấm vải ban đầu dài là :
\(42\div\left(1-\frac{2}{5}\right)=70\)( m )
NP
2
A
13 tháng 3 2018
"Computer Dating"
Maurice loved his computer and loved internet dating. Very thorough and logical, he spent months scoring every respondent out of one thousand, cross-referencing virtues and failings; writing hundreds of emails, analysing their replies. Sadly, he never had time to go out and meet anyone, so he married his computer instead.
13 tháng 3 2018
The story that I want to tell people is called "Son Tinh, thuy tinh." The story is about talent and praise Son Tinh can fight floods, natural disasters. Story of the story is as follows: In the 18 th Hung Vuong Dynasty, Hung Vuong had a daughter named My Nuong and My Nuong very beautiful, gentle and gentle, My Nuong also has to get married. The king loves her very much, so she wants to marry her a worthy husband. One day, two boys came to tender offer. One who lives in Tan Vien mountain area, has strange talents: Waving hands east, floating east of the beach; Waving to the west, the west rising up the hills. People call him Son Tinh. And the other in the mountains of Tan Vien also not bad: call the wind, the wind came, the rain, rain. People called him Glass. In the two men, one is the lord, the other is the lord of the water, King Hung is very confused. Finally Hung Vuong was challenged to marry. Wedding conditions are two men to bring the ceremony to honor, the ceremony includes: one hundred sky rice cake, a hundred sky rice cake, ivory elephant, chicken and horse ripe roses each pair of one pair. Anyone who comes to the wedding ceremony will be cherished. And the new light in the morning, the crystal was brought to the ceremony before so the king of the gentleman to give. Glass came later and did not marry his wife should go angry to bring the chase to hit the crystal. Thunder storms, called the wind storm thunder chasing paint. Water flooded the fields, houses, water was raised on the hills, slopes. Charms have been submerged in the sea. But the crystal still does not flinter, Son Tinh has allowed each hill, moving each mountain to prevent the flood. How much to raise water, Crystal clear up high mountains as much. Finally, after a few months of fighting, Glass was exhausted but Son Tinh remained strong. Every year, severe enemas are intense, so Glass still raises Son Tinh but every time loses.
23 tháng 10 2021
a,\(x^5+x-1=x^5+x^4-x^2-x^4-x^3+x+x^3+x^2-1=\left(x^5+x^4-x^2\right)-\left(x^4+x^3-x\right)+\left(x^3+x^2-1\right)=x^2\left(x^3+x^2-1\right)+x\left(x^3+x^2-1\right)+\left(x^3+x^2-1\right)=\left(x^2+x+1\right)\left(x^3+x^2-1\right)\)b,\(y\left(y-2\right)-5=y^2-2y-5=\left(y^2-2y+1\right)-6=\left(y-1\right)^2-\sqrt{6^2}=\left(y-1-\sqrt{6}\right)\left(y-1+\sqrt{6}\right)\)
29 tháng 11 2021
Bài giải:
Thời gian người đó đi quãng đường AB (không kể thời gian nghỉ) là:
(8 giờ 30 phút - 6 giờ 45 phút) - 15 phút = 1 giờ 30 phút
Đáp số: 1 giờ 30 phút
^ HT ^
135
HT
Âm 135 nha