giúp mk câu 12 với ạ
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8 How much do these apples cost?
9 THis is a blue car
11 Are there 40 classrooms in Phong's school?
13 How wide if the Great wall
5) BPT \(\Leftrightarrow\dfrac{30x-45}{60}-\dfrac{20x+20}{60}>\dfrac{30}{60}-\dfrac{36-12x}{60}\)
\(\Leftrightarrow10x-65>12x-6\) \(\Leftrightarrow-2x>59\) \(\Leftrightarrow x< -\dfrac{59}{2}\)
Vậy ...
7) ĐK: \(x\ne-3\)
BPT \(\Leftrightarrow\dfrac{x+1}{x+3}-1>0\) \(\Leftrightarrow\dfrac{x+1}{x+3}-\dfrac{x+3}{x+3}>0\) \(\Leftrightarrow\dfrac{-2}{x+3}>0\)
\(\Rightarrow x+3< 0\) \(\Leftrightarrow x< -3\)
Vậy ...
9) Sửa đề: \(\dfrac{x^2+2x+2}{x^2+3}\ge1\)
\(\Leftrightarrow\dfrac{x^2+2x+2}{x^2+3}-1\ge0\) \(\Leftrightarrow\dfrac{x^2+2x+2}{x^2+3}-\dfrac{x^2+3}{x^2+3}\ge0\) \(\Leftrightarrow\dfrac{2x-1}{x^2+3}\ge0\)
\(\Rightarrow2x-1\ge0\) \(\Leftrightarrow x\ge\dfrac{1}{2}\)
Vậy ...
11) BPT \(\Leftrightarrow3x-2\le0\) \(\Leftrightarrow x\le\dfrac{2}{3}\)
Vậy ...
1 send - will receive
2 do - will improve
3 find - will give
4 will go - has
5 will go- gets
6 doesn't phone - will leave
7 don't study - won't pass
8 rains - won't have to
9 won't be able - watch
10 can't move - isn't
11 study - will pass
a computer is used to do that job nowadays
He will be seen off at the airport by all his friends
Beer used to be drunk for breakfast in England years ago
Tea can not made with cold water.
the floor was being cleaned when i arrived
Should Julia be helped with the sewing ?
will you promise nhé