TH1: x ≥ 10 thì phương trình trở thành:
x - 10 - 2(x+1) =0
⇔ x -10 - 2x - 2 = 0
⇔ -x - 12 = 0
⇔ x = -12 (không thỏa mãn)
TH2: -1≤ x < 10 thì ptrình trở thành:
10 - x - 2(x +1) =0
⇔ 10 - x - 2x - 2=0
⇔8 - 3x =0
⇔ x = 8/3 (thỏa mãn)
TH3: x < -1 thì ptrình trở thành:
10 - x - 2(-x-1) =0
⇔ 10 - x +2x +2 =0
⇔12 + x =0
⇔ x = -12 (thỏa mãn)
Vậy ......... ( tự kết luận nha)
Bạn là Wannable ak???
\(\left(4x-3\right)-\left(x+5\right)=3\left(10-x\right)\)
Cho đa thức: \(f\left(x\right)=x+x^2-6x^3+3x^4+2x^2+6x-2x^4+1\)
1. Thu gọn, rồi sắp xếp các số hạng của đa thức theo lũy thừa giảm dần của biến \(x\)
2. Xác định, bậc của đa thức, hệ số tự do, hệ số cao nhất
3. Tính \(f\left(-1\right),f\left(0\right),f\left(1\right),f\left(-a\right)\)
1. Tìm x
a) 3,2. x + (-12).x + 2,7 = -4,9
b) -5,6.x + 2,9.x -3,86= -9,8
2. tính Giá trị
A= -5,13:\(\left(5\dfrac{5}{28}-1\dfrac{8}{9}.1.25+1\dfrac{16}{63}\right)\)
B= \(\left(3\dfrac{1}{3}.1,9+19,5:4\dfrac{1}{3}\right).\left(\dfrac{62}{75}-\dfrac{4}{25}\right).\)
\(^{\left(-7\right)^x}\)=\(\frac{1}{49}\)
tìm x nhé
Cho biểu thức: \(P\left(x\right)=x^3+\text{ax}+b\). Biết rằng P(0) và P(1) đều chia hết cho 3. Chứng tỏ rằng P(x) có giá trị là bội của 3 với mọi giá trị nguyên của x
Match the nouns from the box with the correct verb.
1. go : ......
2. do : ......
3. collect : ......
4. play : ......
5. watch : ......
6. take : ......
you must keep to... when you travel in uk
a.the left b.the right c.on the left d.on the right
1. Arrange these sentences to make a conversation.
On the street in an English town, a policeman stops a car. In the car there í a visitor from another country who does not know that traffic in England keeps to the left.
1. But you said I was driving on the right side.
2. Stop!
3. Why are you driving on the right side of the road?
4.It's like a looking - glass! But I'll try to remember.
5. A strange country! If right is wrong, I'm right when I'm on wrong side. So why đi you stop me?
6. That's right! You are on the right, and that's wrong.
7. Do you want me to drive on the wrong side.
8. What's the matter?
9. You are driving on the wrong side.
10. My dear sir, you must keep to the left. The right side is left.
Your answer: .............................................
Arrang these sentences to make a conversation
1. But you said I was driving on the right side
2. Stop!
3. Why are you driving on the right of the road
4. It's like a looking-glass! But I'll try to remember.
5. A strange country! If right is wrong, I'm right when I'm on wrong side. So why did you stop me?
6. That's right! You are on the right, and that's wrong
7. Do you want me to drive on the wrong side?
8. What is the matter?
9. You are driving on the wrong side.
10. My dear sir, you must keep to the left. The right side is left
Your answer:...............................................................................................
