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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
`[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}`
\(\dfrac{x+4}{5}-x+4=\dfrac{x}{3}-\dfrac{x-2}{2}\)
\(\Leftrightarrow\dfrac{6\left(x+4\right)+30\left(4-x\right)}{30}=\dfrac{10x-15\left(x-2\right)}{30}\)
\(\Leftrightarrow6\left(x+4\right)+30\left(4-x\right)=10x-15\left(x-2\right)\)
\(\Leftrightarrow6x+24+120-30x=10x-15x+30\)
\(\Leftrightarrow-19x=-114\)
\(\Leftrightarrow x=6\)
Vậy \(S=\left\{6\right\}\)
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.
bạn vào tiếng anh123 đi vui lắm còn hay nữa, nó giúp bạn nắm vững kiến thức và có nhiều tù mới nữa
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 = \(\dfrac{8}{9}\)
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 \(AM=\dfrac{BC}{2}=6.5\left(cm\right)\)
Phân số là : \(\dfrac{8}{20}\)
hai hình tam giác tạo thành 1 hình vuông
\(\dfrac{8}{20}\)