Giup mình vs mình đg cần gấp cảm ơn mn trước ạ
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14.He asked me to help my withe the exercises.
15.He said he left early on Friday.
16.She asked me where he would meet that night.
17.Milk could be used for making butter and cheese.
18.Bottles of milk are brought to houses by the milkman.
19.A lot of beautiful toys are made from recyced plastic.
20.The concerts usually are held at the university.
1. John was sad yesterday.
2. The birds were in the cage.
3. The children were in the class.
4. My cat was on the chair.
5. I was at the theater yesterday.
6. It was foggy this morning.
7. They were at home last Sunday.
8. I was very happy yesterday.
9. There were a lot of balloons.
10. You were at the park last night.
Độ dãn của lò xo:
\(F_{đh}=k\cdot\Delta l\Rightarrow\Delta l=\dfrac{F_{đh}}{k}=\dfrac{2}{100}=0,02\)m=2cm
1: A=-1/2*xy^3*4x^2y^2=-2x^3y^5
Bậc là 8
Phần biến là x^3;y^5
Hệ số là -2
2:
a: P(x)=3x+4x^4-2x^3+4x^2-x^4-6
=3x^4-2x^3+4x^2+3x-6
Q(x)=2x^4+4x^2-2x^3+x^4+3
=3x^4-2x^3+4x^2+3
b: A(x)=P(x)-Q(x)
=3x^4-2x^3+4x^2+3x-6-3x^4+2x^3-4x^2-3
=3x-9
A(x)=0
=>3x-9=0
=>x=3
a: Để (d) cắt (d') thì \(\frac{1}{m}<>-m\)
=>\(-m^2<>1\)
=>\(m^2<>-1\) (luôn đúng)
=>(d) luôn cắt (d')











Câu 11: MNPQ là hình bình hành
=>\(\hat{M}+\hat{N}=180^0\)
mà \(\hat{M}-\hat{N}=40^0\)
nên \(\hat{M}=\frac{180^0+40^0}{2}=110^0;\hat{N}=110^0-40^0=70^0\)
MNPQ là hình bình hành
=>\(\hat{M}=\hat{P}\)
=>\(\hat{P}=110^0\)
MNPQ là hình bình hành
=>\(\hat{N}=\hat{Q}\)
=>\(\hat{Q}=70^0\)
=>Chọn D
Câu 10: Gọi chiều rộng là x(m)
(Điều kiện: x>0)
Chiều dài là 1,6x(m)
Nửa chu vi là 26:2=13(m)
=>x+1,6x=13
=>2,6x=13
=>x=5
=>Chiều dài là 1,6*5=8(m)
Diện tích là\(5\cdot8=40\left(m^2\right)\)
=>Chọn D
Câu 9: B