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DT
Đỗ Thanh Hải
CTVVIP
16 tháng 10 2021
1 to finish
2 adding
3 to have
4 to do
5 to finish
6 working
7 writing
8 to complete
9 to get
10 to show
11 putting
12 to be
13 to email
14 to remember
NT
2
2
11 tháng 5 2022
`[x+4]/5-x+4=x/3-[x-2]/2`
`<=>[6(x+4)-30(x-4)]/30=[10x-15(x-2)]/30`
`<=>6x+24-30x+120=10x-15x+30`
`<=>6x-30x-10x+15x=30-24-120`
`<=>-19x=-114`
`<=>x=6`
Vậy `S={6}`
11 tháng 5 2022
\(\dfrac{x+4}{5}-x+4=\dfrac{x}{3}-\dfrac{x-2}{2}\)
\(\Leftrightarrow\dfrac{6\left(x+4\right)+30\left(4-x\right)}{30}=\dfrac{10x-15\left(x-2\right)}{30}\)
\(\Leftrightarrow6\left(x+4\right)+30\left(4-x\right)=10x-15\left(x-2\right)\)
\(\Leftrightarrow6x+24+120-30x=10x-15x+30\)
\(\Leftrightarrow-19x=-114\)
\(\Leftrightarrow x=6\)
Vậy \(S=\left\{6\right\}\)
10 tháng 8 2021
23. The meeting will be held before the May Day.
24. The engine of the car has to be repaired.
25. The window was broken and some pictures were taken away by the boys.
26. A lot of money is spent on advertising everyday.
27. This room may be used for the classroom.
28. A story is going to be told.
29. The cake is being cut with a sharp knife.
30. The women with a red hat was looked at by the children.
31. My hat used to be pulled over my eyes.
32. For the past ten years, all my washing has been done by hand.
33. A nest has been built in the porch by a pair of Robins since last week.
34. The murder hasn't been found yet.
35. One of her paintings was sold at $1,000.
36. Your gloves will be put back in the drawer.
37. English is spoken in almost every coroner of the world.
38. The first prize was awarded to the reporter by the board.
39. Has the Chritmas card been sent to your family?
40. THe broken cup was hidden in the drawer.
BN
4
NT
4
16 tháng 1 2018
bạn vào tiếng anh123 đi vui lắm còn hay nữa, nó giúp bạn nắm vững kiến thức và có nhiều tù mới nữa
giúp tôi với đi mọi người
TT
23 tháng 12 2021
Bài 1:
a) 2x(x2 - 4x + 1)
= 2x3 - 8x2 + 2x
b) (16x5y4 - 8x4y3) : 4x2y2 + 2x2y
= 4x3y2 - 2x2y + 2x2y
= 4x3y2
c) \(\dfrac{x+2}{x}\) + \(\dfrac{5-x}{x+2}\)
= \(\dfrac{\left(x+2\right)^2+x\left(5-x\right)}{x\left(x+2\right)}\)
= \(\dfrac{x^2+4x+4+5x-x^2}{x\left(x+2\right)}\)
= \(\dfrac{4+9x}{x\left(x+2\right)}\)
Bài 2:
(3x + 2)(3x - 2) - 9x(x - 1) = 4
9x2 - 4 - 9x2 + 9x = 4
9x = 8
x = \(\dfrac{8}{9}\)
11 tháng 10 2021
Xét ΔABC vuông tại A có
\(BC^2=AB^2+AC^2\)
hay BC=13(cm)
Xét ΔABC vuông tại A có AM là đường trung tuyến ứng với cạnh huyền BC
nên \(AM=\dfrac{BC}{2}=6.5\left(cm\right)\)
Answer:
\(y^2-25-\left(y+5\right)=0\)
\(\Rightarrow y^2-5^2-\left(y+5\right)=0\)
\(\Rightarrow\left(y-5\right).\left(y+5\right)-\left(y+5\right)=0\)
\(\Rightarrow\left(y+5\right).[\left(y-5\right)-1]=0\)
\(\Rightarrow\left(y+5\right).\left(y-6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}y+5=0\\y-6=0\end{cases}}\Rightarrow\orbr{\begin{cases}y=5\\y=-6\end{cases}}\)
\(y^4-2y^3+10y^2-20y=0\)
\(\Rightarrow\left(y^4-2y^3\right)+\left(10y^2-20y\right)=0\)
\(\Rightarrow y^3.\left(y-2\right).\left(y^3+10y\right)=0\)
\(\Rightarrow y.\left(y-2\right).\left(y^2+10\right)=0\)
Trường hợp 1: \(y=0\)
Trường hợp 2: \(y-2=0\Rightarrow y=2\)
Trường hợp 3: \(y^2+10=0\Rightarrow y^2=-10\) (Loại)