\(\dfrac{201-x}{99}+\dfrac{203-x}{97}+\dfrac{205-x}{95}+3=0\)

\(\Leftrightarrow\left(\dfrac{201-x}{99}+1\right)+\left(\dfrac{203-x}{97}+1\right)+\left(\dfrac{205-x}{95}+1\right)=0\)

\(\Leftrightarrow\left(\dfrac{300-x}{99}\right)+\left(\dfrac{300-x}{97}\right)+\left(\dfrac{300-x}{95}\right)=0\)

\(\Leftrightarrow\left(300-x\right)\left(\dfrac{1}{99}+\dfrac{1}{97}+\dfrac{1}{95}\right)=0\)

\(\Leftrightarrow300-x=0\)

\(\Leftrightarrow x=300\)

Vậy \(S=\left\{300\right\}\)

Em muốn lấy đầy đủ cả bài hay chỉ những phần học ở lớp 9 vậy

ngocdiem pham Nếu đầy đủ cả bài thì có 3254 câu đấy e

\(I=100mA=0,1A\)

\(l=200cm=2m\)

Lực từ tác dụng lên dây dẫn:

\(F=B\cdot I\cdot l\cdot sin\alpha\)

\(\Rightarrow F=4\cdot10^{-2}\cdot0,1\cdot2=8\cdot10^{-3}N\)

Không nên đăng những thứ này nhưng chúng ta có thể nói chuyện với nhau mà

Mình rất xấu nhưng đăng cho vui thôi ^-^

kb vs mk đi , mà kb rồi , nt vs mk , mk đag bùn

ok Thủ Lĩnh Ánh Sáng

nó là the same , chúc bạn học tốt

the same

1+1=2

160+123=283

1+1=2....160+123=283nha>>học tốt.

1. English is more interesting than music.

2. Today they are not as happy as they were yesterday.

3. Ha Noi is not as small as Hai Duong.

4. Mai's sister is not as pretty as her.

6. You have got more money than me.

7. Art is not as difficult as French.

8. Nam's father is more careful than him.

9. No one in our town is as rich as Mr Ron.

10. He is the most intelligent in my class.

11. Everest is the highest mountain in the world.

12. Minh is the fattest person in my group.

13. I can't swim as far as Jan.

14B 15C 16A 17C 18B 19C 20B

bạn có thể chụp thẳng đc hong?????