\(\Rightarrow\left(x-3\right)\left[\left(x-3\right)^x-\left(x-3\right)^{10}\right]=0\)

\(\Rightarrow\left[\begin{array}{nghiempt}x-3=0\\\left(x-3\right)^x-\left(x-3\right)^{10}=0\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=3\\\left(x-3\right)^x=\left(x-3\right)^{10}\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=3\\x=10\end{array}\right.\)

Vậy \(x\in\left\{3;10\right\}\)

\(Ư_{12}=\left\{1;2;3;4;6;12;-1;-2;-3;-4;-6;-12\right\}\)

thoi gian du dinh la 3nhan2=6 thoi gian di la doi 2gio 30phut=2.5gio hieu van toc la 6-5=1phan van toc du dinh la 9:1nhan5=45km quang duong ab dai la 45nhan 3=135km.          dap so135km

\(C=\frac{3}{2}\left(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+......+\frac{1}{99}-\frac{1}{101}\right)\)

\(C=\frac{3}{2}\left(1-\frac{1}{101}\right)\)

\(C=\frac{3}{2}.\frac{100}{101}=\frac{150}{101}\)

Gọi số giấy 3 lớp thu được lần lượt là a ; b ; c

=> \(a=b-5\) (1)

   \(c=a+8\) (2)

a+b+c=618 (3)

Thay (1) và (2) vào (3) ta được

\(b-5+b+b+8=618\)

\(\Rightarrow3b=615\)

\(\Rightarrow b=205\)

=> a=200

     b=213

Vậy số giáy vụn 3 lp thu được lần lượt là 200;205;213

1.Tom.......does not collect........stamps.(not / collect)

2.You........do not sing.......songs in the bathroom.(not / sing)

3.Julie..........does not work....... in the garden.(not /work)

4.I.........Do'nt sitting..........at home.(not /sit)

5.Tina and Kate ...........do not take................the windows.(not /open)

6.Adam.......does not speak..........Fench.(not/speak)

7.His sister.......does not like...........lemonade. (not/like)

8.We ..........do not listen.............to music.(not/listen)

9.My father .....does not clean.................the car every Saturday.(not/clean)

10.Johnny and Dansy .............do not swim............in the lake.(not/ swim)

1, Thuy is a more fluent French speaker than Phong

~~> Thuy speaks French more  fluentlier than Phong does

2, He plays football better than me.

~~> I don't  play football as well as he does

3, Mrs Hoa doesn't work as hard as her husband.

~~> Mrs Hoa' s husband works hard than she does

4, She runs faster than me.

~~> I don't run as fast as she does

5, He doesn't understand the lessons as well as last year.

~~> Last year he understood the lesson more well than he doees nơ

Gọi 3 số cần tìm là a ; b ; c

\(\Rightarrow\frac{a}{1}=\frac{b}{2};\frac{b}{1}=\frac{c}{2}\)

\(\Rightarrow\frac{a}{1}=\frac{b}{2}=\frac{c}{4}\)

Áp dụng tc của dãy tỉ số bằng nhau Ta có

\(\frac{a}{1}=\frac{b}{2}=\frac{c}{4}=\frac{a+b+c}{1+2+4}=\frac{-84}{7}=-12\)

\(\Rightarrow\begin{cases}a=-12\\b=-24\\c=-48\end{cases}\)

Vậy 3 số cần tìm lần lượt là \(-12;-24;-48\)

\(\left(x+3\right)^3-x\left(x-9x\right)=27\)

\(\Rightarrow x^3+9x^2+27x-x^3-9x^2=27x\)

\(\Rightarrow\left(x^3-x^3\right)+\left(9x^2-9x^2\right)+27x=27\)

\(\Rightarrow27x=27\)

\(\Rightarrow x=1\)

Vậy x=1