\(\frac{8^7.15^7}{4^7.50^7}\)

\(=\left(\frac{8.15}{4.50}\right)^7\)

\(=\left(\frac{2^3.3.5}{2^3.5^2}\right)^7\)

\(=\left(\frac{3}{5}\right)^7\)

\(=\frac{3^7}{5^7}\)

=(2^3)^7.(3.5)^7/(2^2)^7.(2.5^2)^7

=2^21.3^7.5^7/2^14.2^7.5^14

=3^7/5^7

=(3/5)^7

\(\frac{8^7.15^7}{4^7.50^7}=\frac{\left(2^3\right)^7.3^7.5^7}{\left(2^2\right)^7.2^7.\left(5^2\right)^7}=\frac{2^{21}.3^7.5^7}{2^{14}.2^7.5^{14}}=\frac{2^{21}.3^7.5^7}{2^{21}.5^{14}}=\frac{3^7}{5^7}=\frac{2187}{78125}\)

Đầu bài la viết h ak bạn!

Mk lm 2 cách cho bn nhá!

8.25>eight twenty five>twenty five past eight

9.45>nine forty five>fifteen to ten

10.05>ten five>five past ten

11.15>eleven fifteen>a quarter past eleven

7.50>seven fifty>ten to eight

6.40>six forty>twenty to seven

12.00>twelve(o'clock)

5.30>five thirty>half past five

Chúc bạn hk tốt nha!

Chọn B

B

B

I. Nội qui tham gia "Giúp tôi giải toán"

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

27+27=54

27+27=71

-2/15

-4/35

-5/3

10

-8/3

-7/2

-9

-4/3

Chúc em học giỏi

\(=\dfrac{-2}{15}\\ =\dfrac{-4}{35}\\ =-1\\ =10\\ =\dfrac{-8}{3}\\ =-7\\ =-9\\ =\dfrac{-4}{3}\)

-2/15

-4/35

-5/3

10

-8/3

-7/2

-9

-4/3

a) The shop (open)opens at 8.30 a.m and (closes) at 10.30 p.m

b) Does This restaurant open (open) at 7.50 a.m?

c) Do These shops (close)close at 9.30 p.m?

d) This shirt (be)is very expensive.

đ) The students (write) are writing the lesson now.

e) The children (play) are playing in the playground at the moment.

f) He (not sleep)isn't sleeping now. He (read)is reading novel.

g) They (like)like cooking. So they cook well.

h) There (be)are five books on the tables.

j) These sweaters (not be)aren't pink. They (be) are red.

k) Their sons (go)are going to the movie tonight.

a) The shop (open) opens at 8.30 a.m and (close) closes at 10.30 p.m

b) Does This restaurant (open) open at 7.50 a.m?

c) Do These shops (close) close at 9.30 p.m?

d) This shirt (be) is very expensive.

đ) The students (write) are writing the lesson now.

e) The children (play) are playing in the playground at the moment.

f) He (not sleep) isn't sleeping now. He (read) is reading novel.

g) They (like) like cooking. So they cook well.

h) There (be) are five books on the tables.

j) These sweaters (not be) aren't pink. They (be) are red.

k) Their sons (go) are going to the movie tonight.

a, opens - closes

b, Does this restaurant open..?

c, Do these shops close...?

d, is

đ, are writing

e, is playing

f, isn't sleeping - is reading

g, like 

h, are

j, aren't - are

k, go

a) (−27). 1011 − 27. (−12) + 27. (−1)

= (-27). (1011 - 12 + 1)

= (-27). 1000 = -27 000

b) (−9). (−9). (−9) + 103 + 9.3

= (-9). 3 + 103 + 9.3

= 9.3 - 9.3 + 103

= 0 + 103 = 103

c) (−157). (127 − 316) − 127. (316 − 157)

= (-157). 127 - 316. (-157) - 127.316 - 127. (-157)

= (-157). 127 + 316. 157 - 127. 316 + 127.157

= (127.157 - 157.127) + (316. 157 - 127.316)

= 0 + (157 - 127). 316

= 0 + 30. 316

= 9480