This is Mr.Huong. She is living on Phuong Mai street. She teaches English at Vin school. Everyday, she goes to school by motobike. Students s her bacause she teaches English in a special way. Ms.Huong often tells students English stories or game before the lessons. So, students learns English easily. They also find English interesting sybject.

=> This is Ms.Huong. She is living on Phuong Mai street. She teaches English at Vin school. Everyday, she goes to school by motobike. Students s her because she teaches English in a special way. Ms.Huong often tells students English stories or game before the lessons. So, students learns English easily. They also find English interesting subject.

mr -> ms
bacause -> because
sybject -> subject
hok tốt

k mình đi

Vì mình ko biết làm

Yên tâm đi vì mình sẽ ko k lại bạn đâu

a) \(5^x\cdot5^6=5^4\)

\(5^x=5^{4-6}\)

\(5^x=5^{-2}\)

=> x = -2

b) \(\left(5x+1\right)^2=\left(\pm\frac{6}{7}\right)^2\)

+) 5x + 1 = 6/7

5x = -1/7

x = -1/35

+) 5x + 1 = -6/7

5x = -13/7

x = -13/35

Vậy,.........

\(1\frac{13}{15}\cdot\left(0,5\right)^2\cdot3-\left(\frac{8}{15}+1\frac{19}{60}\right):1\frac{19}{60}\)

\(=\frac{28}{15}\cdot\frac{1}{4}\cdot\frac{3}{1}-\frac{37}{20}\cdot\frac{60}{79}\)

\(=\frac{7}{5}-\frac{111}{79}\)

\(=\frac{-2}{395}\)

=28/15.1/4.3-8/15-79/60.60/79

=7.4/15.1/4.3-8/15-1

=7/15.3-8/15-1

=21/15-8/15-1

=13/15-1

=-2/15

Gọi thương và số dư bằng k . Ta có:

          a = 3k + k ( k < 3 )

nên    a = 4k với k = 0  ; 1 ; 2

Với k = 0 => a = 0

Với k = 1 => a = 4

Với k = 2 => a = 8

Vậy số tự nhiên a là 0 ; 4 ; 8