\(\dfrac{20x\left(2-x\right)}{12x\left(x-2\right)^2}=\dfrac{5.4.x\left(2-x\right)}{3.4.x\left(2-x\right)^2}=\dfrac{5}{3\left(2-x\right)}\)
\(=\dfrac{-20x\left(x-2\right)}{12x\left(x-2\right)^2}=\dfrac{-5}{3\left(x-2\right)}\)
\(\dfrac{20x\left(2-x\right)}{12x\left(x-2\right)^2}=\dfrac{5.4.x\left(2-x\right)}{3.4.x\left(2-x\right)^2}=\dfrac{5}{3\left(2-x\right)}\)
\(=\dfrac{-20x\left(x-2\right)}{12x\left(x-2\right)^2}=\dfrac{-5}{3\left(x-2\right)}\)
Bài 4: Rút gọn các biểu thức sau:
a)A=(2x+y)2-(y-2x)2
b)B=x2-y2+(x-y)2
1. Phân thích đa thức thành nhân tử
a) \(x^3-2x^2-6x+12\)
b) \(x^4-7x^2+12\)
c) \(x^2-5x+4\)
d) \(3x^2+5x+2\)
e) \(x^3-x+3x^2y+3xy^2+y^3-y\)
Bài này là rút gọn mệnh đề, mn giúp e với:(
l. The baby is crying for her mother. She is sitting in an armchair. ............................................................................................................
2. The boy was taken to the hospital. He was injured in the accidem. ............................................................................................................
3. The road is very narrow. It joins the two villages ............................................................................................................
4. Do you know the woman? The woman is talking to Tom. ............................................................................................................
5. The window has been repaired. It was broken last night. ............................................................................................................
6. The taxi broke down. It was taking us to the airport. ............................................................................................................
7. A bridge has been declared unsafe. It was built only two years ago. ............................................................................................................
8. Most of the goods are exported. They are made in this factory. ............................................................................................................
9. A new factory has just opened in the town. The factory employs 500 people. ............................................................................................................
10.“Rorneo and Juliet” is the best tragedy I have ever seen. It was written by Shakespeare. ............................................................................................................
1. Chứng minh |x-y|<|1-xy| với |x|<1,|y|<1
2. a) Tìm GTNN của biểu thức A=x^2-2x+1975/x^2
b) Cho x,y>0, x+y=1. Chứng minh: 2(x^4+y^4)+1/2xy>=2.1/4
Phân tích tha hf nhân tử :
a) a^2 ( x - y ) + y - x .
b) m^2 - 25y^2 + 10y - 1
c) a^2 - 4x^2 + 8x -4
Change all of the adjective clauses to adjective phrases. Use the participles. (Rút gọn bằng Ving – Ved/V3)
1. Only a few of the movie that are shown at the Gray Theater are suitable for children.
2. The couples who live in the house next door are both college professors.
3. A knuckle is a point that connects a finger to the rest of the hand.
4. Antarctica is covered by a huge ice cap that contains 70 percent of the earth's fresh water.
5. Only a small fraction of the eggs that are' laid by a fish actually hatch and survive to adulthood.
6. Our solar system is in a galaxy that is called the Milky Way.
7. None of the pedestrians who were walking up and down the busy street stopped to help the elderly man who was slumped in the door way.
8. Food that passes from the mouth to the stomach goes through a tube which is called the esophagus.
9. Animals that are born in a zoo generally adjust to captivity better than those that are captured in the wild.
________________________________________________________________________________________
10. The children attended a special movie program that consisted of cartoons that featured Donald Duck and Mickey Mouse.
________________________________________________________________________________________
11. The Indians who lived in Peru before the discovery of the New World by Europeans belonged to the Incan culture.
________________________________________________________________________________________
12. I was awakened by the sound of laughter which came from the room which was next to mine at the motel.
Phân tích đa thức sau : x^11+x^8+1
phân tích nhân tử bằng cách thêm bớt cùng 1 hạng tử
a,x3 - 5x2 + 8x - 4
b,x3 - 5x2 +3x +9
c,x3 + 8x2 + 17x + 10
d,x4 +2x3 +x2 + x + 1
Tìm x
Y) x^2-x-6=0
Z) 3x² –5x–8=0
J) 25x^2-4=0
R) 2(x+3)-x^2-3x=0
U. x³–3x² –x+3=0
Giúp mik vs mình cần gấp