\(\frac{11}{30}\) + \(\frac{18}{35}\) x (\(\frac{35}{54}\) - \(\frac{49}{18}\) - \(\frac{28}{48}\))

= \(\frac{11}{30}\) + \(\frac{18}{35}\) x \(\frac{35}{54}\) - \(\frac{18}{35}\) x \(\frac{49}{18}\) - \(\frac{18}{35}\) x \(\frac{28}{48}\)

= \(\frac{11}{30}\) + \(\frac13\) - \(\frac75\) - \(\frac{3}{10}\)

= \(\frac{11}{30}\) + \(\frac{1\times10}{3\times10}\) - \(\frac{7\times6}{5\times6}\) - \(\frac{3\times3}{10\times3}\)

= \(\frac{11}{30}\) + \(\frac{10}{30}\) - \(\frac{42}{30}\) - \(\frac{9}{30}\)

= \(\frac{21}{30}\) - \(\frac{42}{30}\) - \(\frac{9}{30}\)

= \(\frac{-21}{30}\) - \(\frac{9}{30}\)

= \(\frac{-30}{30}\)

= 1

=1

(2\(x\) - 1)\(^3\) = - \(\frac{8}{64}\)

(2\(x-1\))\(^3\) = (- \(\frac24\))\(^3\)

2\(x-1\) = - \(\frac24\)

2\(x\) = - \(\frac24\) + 1

2\(x\) = \(\frac12\)

\(x=\frac12:2\)

\(x\) = \(\frac14\)

Vậy \(x=\frac14\)

- \(\frac{5}{17}\) x (\(\frac35x\) - 0,75) = 0

\(\frac35x\) - 0,75 = 0

\(\frac35\)\(x\) = 0,75

\(x=0,75:\frac35\)

\(x\) = \(\frac54\) \(\)

Vậy \(x=\frac54\)

1. A. sandwich B. chocolate C. cartoon D. toothpaste

Đây là bài tập trọng âm (stress).

A. sandwich – trọng âm rơi vào âm 1

B. chocolate – trọng âm rơi vào âm 1

C. cartoon – trọng âm rơi vào âm 2

D. toothpaste – trọng âm rơi vào âm 1

Đáp án đúng: C. cartoon (khác với các từ còn lại về vị trí trọng âm)

2. A. correct B. receive C. visit D. unload

Cũng là bài tập về trọng âm.

A. correct – trọng âm rơi vào âm 2

B. receive – trọng âm rơi vào âm 2

C. visit – trọng âm rơi vào âm 1

D. unload – trọng âm rơi vào âm 2

Đáp án đúng: C. visit (trọng âm rơi vào âm 1, khác với các từ còn lại)

1 C

2 C

1, Anna is good at painting.

-> Anna can ...paint well

2, No city in Vietnam is more modern than Ho Chi Minh City.

-> Ho Chi Minh City is ...the most modern city in Vietnam

B. Rewrite the sentences so that they mean the same. Use the words in the brackets.

1, She can sing. She can dance. (BOTH)

-> ...She can both sing and dance

2, Tom plays football. His brother plays football too. (AND)

-> ...Tom and His brother play football

1, My mother/ buy/ newclothes/ me/ Tet

My mother buys new clothes for me before Tet

2, There / be/ many flowers/ the garden/ during/ Tet

There are many flowers in the garden during Tet

3, Children/ get/ lucky money/ from/ adults

Children get lucky money from adults

4, We/ clean/ house/ before/ Tet

We clean our house before Tet

5, My family /have/ big/ dinner/ New Year's Eve

My family have a big dinner on New Year's Eve

6, People/ decorate/ houses/ with/ flowers and red banners

People decorate their houses with flowers and red banners

1. B

2. C

3. B

4. B

5. C

6. B

7. A

8. C

1 B

2 C

3 B

4 B

5 A

6 B

7 A

8 C

phủ định :

It may not cost $100.

nghi vấn :

May it cost $100 ?

It may not cost $100.

May it cost $100?

bạn tick mình nek

(\(x+2)\)\(^2\) - 9

= (\(x+2\))(\(x+2\)) -9

= \(x\left(x+2\right)\) + 2(\(x\) + 2) - 9

= \(x^2\) + 2\(x\) + 2\(x\) + 4 - 9

= \(x^2\) + (2\(x+2x\)) - (9 - 4)

= \(x^2\) + 4\(x\) - 5

(x + 2)\(^2\) - 9

= (x + 2) . (x + 2) - 9

= x (x + 2) + 2 (x + 2) - 9

= (\(x^2\) + 2x) + (2x + 4) - 9

= \(x^2\) + 2x + 2x + 4 - 9

= \(x^2\) + 4x + 4 - 9

= \(x^2\) + 4x - 5

1,8 nek bạn

= 9/5 = 1,8 nha