Đề bài yêu cầu gì?

BTKL: \(a=\Sigma m_{O_2}=m_{hh\text{ oxit}}-m_{hh\text { KL}}=14,2-7,8=6,4(g)\)

\(m_{HCl\left(1\right)}=600.2,5\%=15g\\ m_{HCl\left(2\right)}=400.15\%=60g\\ C\%_{HCl.sau}=\dfrac{75}{1000}\cdot100\%=7,5\%\)

\(ĐK:\left\{{}\begin{matrix}2-x\ge0\\x-2\ge0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\le2\\x\ge2\end{matrix}\right.\Leftrightarrow x=2\)

Thay \(x=2\Leftrightarrow2=8\left(\text{vô lí}\right)\)

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Ko lấy trên gg

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