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3 tháng 12 2021
BTKL: \(a=\Sigma m_{O_2}=m_{hh\text{ oxit}}-m_{hh\text { KL}}=14,2-7,8=6,4(g)\)
12 tháng 3 2023
\(m_{HCl\left(1\right)}=600.2,5\%=15g\\ m_{HCl\left(2\right)}=400.15\%=60g\\ C\%_{HCl.sau}=\dfrac{75}{1000}\cdot100\%=7,5\%\)
2 tháng 12 2021
\(ĐK:\left\{{}\begin{matrix}2-x\ge0\\x-2\ge0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\le2\\x\ge2\end{matrix}\right.\Leftrightarrow x=2\)
Thay \(x=2\Leftrightarrow2=8\left(\text{vô lí}\right)\)
Vậy PT vô nghiệm
10 tháng 11 2021
Tham khảo!
https://mobitool.net/top-10-bai-van-bieu-cam-ve-loai-cay-em-yeu.html
Bạn bôi đen dòng chữ ở trên rồi mở nhé!
DT
Đỗ Thanh Hải
CTVVIP
3 tháng 10 2021
7 more slowly than
8 better than
9 more quickly
10 more powerful than
11 more easily
12 harder
13 more carefully
14 better than
15 more frequently than
16 more than
Bài 2
1 more carefully
2 more slowly
3 ko có từ để điền
4 more often
5 earlier
6 farther
7 reliable
8 more peacefully than
9 more easily
10 better
11 worse
12 more quiet
13 more quiet
14 bigger
48. My brother whose house was broken in called the police.
49. Mary was too very tired to study more.
50.If Emily wasn't sick today, she could go to school.
51.Although my grandparents are very busy, they spend a lot of time taking care of us.
52. The floor hasn't been cleaned yet.
53.We haven't seen our grandfather for five month.
54. I wish I could remember the answers to these questions.
55. I spent three hours cleaning the house yesterday.
P8. 48.My brother whose house was broken in called the police.
49. Mary was too tired to study.
50. If Emily wasn't sick today, she could go to school.
51. Although my grandparents are very busy, they spend a lot of time taking care of us.
P9. 52. The floor hasn't been cleaned yet.
53.We haven't seen our grandfaather for five months.
54. I wish I could remember the answer to these questions.
55. I spent three hours cleaning the house yesterday.