6x=5^21-19 +3.4-7

6x=5²+12-7

6x=25+12-7

6x=30

x=30:6

x=5

tick cho mk nha!

1, A

2, B

3, D

4, A

5, C

6, A

7, C

8, B

9, D

10, C

11, B

12, B

13, D

362880

1. The girl is a beautiful

2. My mother's nose is a straight.

3. Chịu

4.That shirtis more expensive than this one.

5.That math exercise is easier than this one

84=2^{3 .}3.7

150=2.3.5²

1a,2b,3f,4d

The/ shop/ the/ most/ watch/ expensive/ this/ is/ in/./

closer/ my school/ to/ her school/ than/ Lan Chi supermarket/ is

1.C

2.D

3.B

4.C

5.A

6.C

7.A

8.D

9.B

10.A

11.D

12.C