Bài 5: Chia dạng đúng của động từ trong ngoặc
1. When I was a child, I (watch) __________ cartoons every Saturday morning.
2. Listen! The band (perform) __________ on the stage right now.
3. The sun (rise) __________ in the east every day.
4. Tomorrow, we (have) __________ a meeting at 10 AM.
5. It's so hot. I (turn on) __________ the air-conditioning.
6. I can't talk right now because I (prepare) __________ dinner for my family.
7. I believe our CEO (become) __________ a successful businesswoman.
8. You (constantly interrupt) __________ me when I am speaking.
9. My grandfather (read) __________ a new science fiction these days.
10. Yesterday, the students (study) __________ for the exam, (go) __________
to the library, and (read) __________ until late.
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![](https://rs.olm.vn/images/avt/0.png?1311)
1am thinking
2 do you want
3 are considering
4 love
5 are
6 does the movie start
7 begins
8 will meet
9 will see
10 look
![](https://rs.olm.vn/images/avt/0.png?1311)
Olm chào em trong trường hợp này em hãy xem lại bài kiểm tra đó trong học bạ, sau đó bấm vào làm lại bài này là được em nhé.
![](https://rs.olm.vn/images/avt/0.png?1311)
a.
(-27) + 8 + 13 + 27
= [ ( -27) + 27 ] + ( 8+13 )
= 0 + 21
= 21
b.
7 + 23 + ( -78) + ( -5)
= ( 7 + 23 ) + [ ( -78) + ( -5) ]
= 30 + ( -83)
= - ( 83 - 30 )
= -53
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(3-\dfrac{15}{7}+x\right)-\left(\dfrac{33}{14}-3x:\dfrac{7}{5}\right)=\dfrac{8}{7}\)
\(3-\dfrac{15}{7}+x-\dfrac{33}{14}+3x:\dfrac{7}{5}=\dfrac{8}{7}\)
\(\left(3-\dfrac{15}{7}-\dfrac{33}{14}\right)+\left(x+3x:\dfrac{7}{5}\right)=\dfrac{8}{7}\)
\(-\dfrac{3}{2}+\left(x+3x\cdot\dfrac{5}{7}\right)=\dfrac{8}{7}\)
\(x+\dfrac{15}{7}x=\dfrac{8}{7}+\dfrac{3}{2}\)
\(x\left(1+\dfrac{15}{7}\right)=\dfrac{37}{14}\)
\(x\cdot\dfrac{22}{7}=\dfrac{37}{14}\)
\(x=\dfrac{37}{14}:\dfrac{22}{7}\)
\(x=\dfrac{37}{44}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Gọi số tiền ban đầu bác gửi là `x` (đồng)
Số tiền góc bác gửi ở năm 2 là: \(x+8\%x=1,08x\) (đồng)
Số tiền góc bác gửi ở năm 3 là: \(1,08x+1,08x\cdot11\%=1,1988x\) (đồng)
Số tiền cả góc lẫn lãi bác nhận được cuối năm 3 là:
\(1,1988x+1,1988x\cdot14\%=1,366632x\) (đồng)
Ta có: \(1,366632x=40998960\)
\(x=\dfrac{40998960}{1,366632}=30000000\) (đồng)
Vậy ban đầu bác dùng 30 triệu để gửi tiết kiệm
Gọi x là số tiền ban đầu Bác Tâm đã gửi vào tài khoản tiết kiệm.
Sau năm thứ nhất: x + 0.08x = 1.08x
Sau năm thứ hai: 1.08x + 0.11(1.08x) = 1.08x + 0.1188x = 1.1988x
Sau năm thứ ba: 1.1988x + 0.14(1.1988x) = 1.1988x + 0.167832x = 1.366632x
Sau ba năm, Bác Tâm rút cả gốc lẫn lãi được 40998960 đồng, nghĩa là:
1.366632x = 40998960
Suy ra:
x = 40998960 / 1.366632 ≈ 30000000
Vậy, lúc đầu Bác Tâm đã gửi vào tài khoản tiết kiệm khoảng 30,000,000 đồng.
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(541+\left(218-x\right)=735\)
\(541+218-x=735\)
\(759-x=735\)
\(x=759-735\)
\(x=24\)
b) \(96-3\left(x+1\right)=42\)
\(3\left(x+1\right)=96-42\)
\(3\left(x+1\right)=54\)
\(x+1=\dfrac{54}{3}\)
\(x+1=18\)
\(x=17\)
c) \(\left(x-47\right)-115=0\)
\(x-47-115=0\)
\(x-162=0\)
\(x=162\)
d) \(\left(x-36\right):18=12\)
\(x-36=12\cdot18\)
\(x-36=216\)
\(x=216+36\)
\(x=252\)
e) \(2^x=16\)
\(2^x=2^4\)
\(x=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(46\left(\dfrac{1}{2}-\dfrac{7}{23}-\dfrac{27}{46}\right):\dfrac{1}{5}\)
\(=46\left(\dfrac{23}{46}-\dfrac{14}{46}-\dfrac{27}{46}\right):\dfrac{1}{5}\)
\(=46\cdot\dfrac{23-14-27}{46}:\dfrac{1}{5}\)
\(=\left(23-14-27\right):\dfrac{1}{5}\)
\(=-18:\dfrac{1}{5}\)
\(=-18\cdot5\)
\(=-90\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
ĐKXĐ: $x\notin\{-5;-4;-3\}$
$\frac{1}{x+5}+\frac{2}{x+4}+\frac{3}{x+3}+3=0$
$\Leftrightarrow \left(\frac{1}{x+3}+1\right)+\left(\frac{2}{x+4}+1\right)+\left(\frac{3}{x+3}+1\right)=0$
$\Leftrightarrow \frac{x+6}{x+5}+\frac{x+6}{x+4}+\frac{x+6}{x+3}=0$
$\Leftrightarrow (x+6)\left(\frac{1}{x+5}+\frac{1}{x+4}+\frac{1}{x+3}\right)=0$
+, TH1: $x+6=0\Leftrightarrow x=-6$ (tm ĐKXĐ)
+, TH2: $\frac{1}{x+5}+\frac{1}{x+4}+\frac{1}{x+3}=0$
$\Leftrightarrow \frac{(x+4)(x+3)+(x+3)(x+5)+(x+4)(x+5)}{(x+3)(x+4)(x+5)}=0$
$\Rightarrow 3x^2+24x+47=0$
$\Leftrightarrow \left[\begin{array}{}x =\frac{-12+\sqrt3}{3}(TM) \\x=\frac{-12-\sqrt3}{3}(TM) \end{array}\right. $
$\text{#}Toru$
ĐKXĐ: \(x\notin\left\{-5;-4;-3\right\}\)
\(\dfrac{1}{x+5}+\dfrac{2}{x+4}+\dfrac{3}{x+3}+3=0\)
=>\(\left(\dfrac{1}{x+5}+1\right)+\left(\dfrac{2}{x+4}+1\right)+\left(\dfrac{3}{x+3}+1\right)=0\)
=>\(\dfrac{x+6}{x+5}+\dfrac{x+6}{x+4}+\dfrac{x+6}{x+3}=0\)
=>\(\left(x+6\right)\left(\dfrac{1}{x+5}+\dfrac{1}{x+4}+\dfrac{1}{x+3}\right)=0\)
=>x+6=0
=>x=-6(nhận)
1. When I was a child, I (watch) ____watched______ cartoons every Saturday morning.
2. Listen! The band (perform) _____is performing_____ on the stage right now.
3. The sun (rise) _____rises_____ in the east every day.
4. Tomorrow, we (have) ____are going to have______ a meeting at 10 AM.
5. It's so hot. I (turn on) _____am turning on_____ the air-conditioning.
6. I can't talk right now because I (prepare) _am preparing_________ dinner for my family.
7. I believe our CEO (become) __will become________ a successful businesswoman.
8. You (constantly interrupt) ____constantly interrupt______ me when I am speaking.
9. My grandfather (read) _is reading_________ a new science fiction these days.
10. Yesterday, the students (study) _studied_________ for the exam, (go) ___went_______ to the library, and (read) _____read_____ until late.