\(b)\frac{9}{5}.x=\frac{18}{25}\)

\(\Rightarrow x=\frac{18}{25}\div\frac{9}{5}=\frac{18}{25}.\frac{5}{9}\)

\(\Rightarrow x=\frac{2}{5}\)

\(e)x-20\%.x=2,5\)

\(\Rightarrow x.\left(1-\frac{1}{5}\right)=\frac{5}{2}\)

\(\Rightarrow x.\frac{4}{5}=\frac{5}{2}\)

\(\Rightarrow x=\frac{5}{2}\div\frac{4}{5}=\frac{25}{8}\)

inviting

meeting

1. Thank you very much for inviting me.

2. Are you going to the meeting tomorrow?

Ta có \(\frac{a}{3}+\frac{a}{2}+\frac{a}{6}=\frac{2a}{6}+\frac{3a}{6}+\frac{a}{6}=\frac{6a}{6}=a\)

Mà a thuộc z nên\(\frac{a}{3}+\frac{a}{2}+\frac{a}{6}\)thuộc Z

Ta có : a/3+a/2+a/6

=2a/6+3a/6+a/6

=2a+3a+a/6

=6a/6=a thuộc Z

BAKCPACK : Ba lô

BOOT : Cô gái

CLASSMATE : Bạn cùng lớp

COMPASS : La bàn

Chúc bn học tốt !

backpack : ba lo

boot" giay ong

classmate: ban cung lop

compass: nghia 1: com pa

               nghia 2 : la ban        

tấm lụa đó dài là:

 5,4 / 15 * 100= 36 <m>

                  đáp số 36 m

tấm vải dài số mét là : 5.4:15x100=36(m)

Đ/s :

Cho dạng đúng của động từ trong ngoặc:

1. "I got a terrible headache."-You'd better (take).....take.........some aspirins.

2. The doctor advised her (brush).......to brush......her teeth twice a day.

3. Fiona and Mary (get).......are getting.....better and better at writing at the moment.

4. I couldn't understand what Tony (say)....said..........

5. Be quiet! I (want).........want.....to hear the news.

6. My sister wastes her free time (play).......playing.......video games.

7.The news today (to be)..........are...very interesing.

1.take

2.to brush

3.are getting

4.is saying

5.want

6.playing

7.is

Tích mk nha

\(\frac{9}{5}.x=\frac{18}{25}\)

\(x=\frac{18}{25}:\frac{9}{5}=\frac{18}{25}.\frac{5}{9}\)

\(x=\frac{2}{5}\)

\(x-20\%.x=2,5\)

\(x\left(1-20\%\right)=2,5\)

\(x.0,8=2,5\)

\(x=2,5:0.8\)

\(x=\frac{25}{8}=3,125\)

\(2^{a+3}+2^{a+5}+2^{a+7}=2^a\cdot\left(2^3+2^5+2^7\right)\))

\(=2^a\cdot168=2^a\cdot42\cdot4⋮42\left(ĐPCM\right)\)