giup voi em dg can gap aj
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$Zn + H_2SO_4 \to ZnSO_4 + H_2$
$n_{H_2} = n_{Zn} = \dfrac{19,5}{65} = 0,3(mol)$
$V_{H_2} = 0,3.22,4 = 6,72(lít)$
$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
Theo PTHH :
$n_{Al} = \dfrac{2}{3}n_{H_2} = 0,2(mol)$
$m_{Al} = 0,2.27 = 5,4(gam)$
![](https://rs.olm.vn/images/avt/0.png?1311)
a: MNPQ là hình bình hành
=>MQ//NP
=>MQ//IP
Xét tứ giác MIPQ có IP//MQ
nên MIPQ là hình thang
b: ΔMNP vuông cân tại N
=>MN=NP và \(\widehat{MNP}=90^0\)
Hình bình hành MNPQ có \(\widehat{MNP}=90^0\)
nên MNPQ là hình chữ nhật
=>\(\widehat{Q}=\widehat{P}=90^0\)
Xét ΔMNI vuông tại N có \(sinNMI=\dfrac{NI}{MN}=\dfrac{2}{3}\)
nên \(\widehat{NMI}\simeq42^0\)
\(\widehat{NMI}+\widehat{QMI}=\widehat{NMQ}=90^0\)
=>\(\widehat{QMI}+42^0=90^0\)
=>\(\widehat{QMI}=48^0\)
IP//MQ
=>\(\widehat{QMI}+\widehat{MIP}=180^0\)(hai góc trong cùng phía)
=>\(\widehat{MIP}+48^0=180^0\)
=>\(\widehat{MIP}=132^0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 4 + x = 3,75
\(x\)x\(\frac{1}{4}\) + \(x=3,75\)
\(x\)x\(\left(\frac{1}{4}+1\right)=\frac{375}{100}\)
\(x\)x\(\frac{5}{4}=\frac{15}{4}\)
\(x=\frac{15}{4}:\frac{5}{4}\)
\(x=\frac{15}{4}\)x\(\frac{4}{5}\)
\(x=3\)
\(\frac{x}{4}+x=3.75\)
\(x\left(\frac{1}{4}+1\right)=\frac{15}{4}\)
\(x\cdot\frac{5}{4}=\frac{15}{4}\)
\(x=\frac{15}{4}:\frac{5}{4}=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1. Going in the rain is interesting.
2. Don't forget to learn by heart new words.
3. If he doesn't apologize me, I won't forgive him.
4. My grandmother is the most helpful (person) in my village.
5. What is the price of that hat?
6. Your book is different from my book.
![](https://rs.olm.vn/images/avt/0.png?1311)
1 Her mother is not as hospitable as her
2 Hung is fond of swimming in the summer
3 Let's travel abroad
4 There are 4 chairs in my room
5 Don't forget to drink more water
6 Minh is the most intelligent student in my class
![](https://rs.olm.vn/images/avt/0.png?1311)
dạ là 12 dề ca mét vuông 30 mét vuông bằng bao nhiêu dề xi mét vuông ạ
![](https://rs.olm.vn/images/avt/0.png?1311)
Bỏ qua cái đề
<=> 24/23 + 2/21 - 1/23+19/4+ 1
= Bấm máy tính ra 575/84
![](https://rs.olm.vn/images/avt/0.png?1311)
\(...=1+1+...+1+1\)
Số số 1 là :
\(\left(2022-2\right):2+1+1=1012\left(số\right)\)
Vậy kết quả là \(1x1012=1012\)
![](https://rs.olm.vn/images/avt/0.png?1311)