Trả lời :

I (swim)... there is a pool near my house, so I go there fours time a week to (swim)......

=> I (swim).swimming.. there is a pool near my house, so I go there fours time a week to (swim)..swim....

Trả lời :

I (swim)... there is a pool near my house, so I go there fours time a week to (swim)......

=> I (swim).swimming.. there is a pool near my house, so I go there fours time a week to (swim)..swim....

~~Học tốt~~

Trả lời :

I think they (move)...... to our hometown

=> I think they (move)...are moving... to our hometown

Trả lời :

I think they (move)...... to our hometown

=> I think they (move)...are moving... to our hometown

Trả lời :

We (go)....to the cinema twice a month.We all love (watch).. the latest fims

=> we (go).....go.....to the cinema twice a month.We all love (watch) ........watching......... the latest fims

we go to the cinema twice a month. We all love watching the latest fims.

It was 1503 when Leonardo da Vinci started to paint la Gioconda.                           

Leonardo da Vinci started paint la Gioconda since 1530.

Chắc vậy

Leonardo da Vinci started to paint la Gioconda in 1503 

\(\frac{2^3.5^2.7^2.3^7}{49.5^3.3^6.11}\)

= \(\frac{24}{55}\)

Hok tốt

\(\frac{2^3.5^{^2}.7^2.3^7}{49.5^3.3^6.11}\)

\(=\)\(\frac{24}{55}\)

Hok tốt

\(\frac{5^{10}.2^{10}}{100^4}\)

\(\frac{10^{10}}{10^8}=100\)

\(\frac{25^5.2^{10}}{20^4.5^4}=\frac{\left(5^2\right)^5.2^{10}}{\left(2.10\right)^4.5^4}=\frac{5^{10}.2^{10}}{2^4.10^4.5^4}=\frac{5^6.2^6}{10^4}=\frac{15625.64}{10000}=\frac{1000000}{10000}=100\)

=3^6 .3^6 /3^12

=3^12/3^12=1

\(\frac{3^6.3^6}{\left(3.27\right)^3}\)

\(\frac{3^6.3^6}{3^3.3^9}\)

\(=\frac{3^{12}}{3^{12}}=1\)

d)Để y nguyên

=>-17 chia hết cho 3-b

=>3-b thuộc Ước của -17

=>3-b=-17 hoặc -1 hoặc 17 hoặc 1

=>3= -20 hoặc 4 hoặc -17 hoặc 2

Để x+10/x+7 là số hữu tỉ âm

=>1+3/x+7 là số hữu tỉ âm

=>3/x-7 < -1

Ta có 3 chia hết x-7

=>x-7 thuộc Ước 3

=<x-7={1,3,-1,-3}

Để * xảy ra => x-7<0

=>x-7={-1,-3}

=>x={6,4}