`@` `\text {Ans}`

`\downarrow`

`67.21 + 33.22`

`= 67.7.3 + 3.11.22`

`= 3.(67.7 + 22.11)`

`= 3.(469 + 242)`

`= 3. 711`

`= 2133`

67.21+33.22

=(66+1).21+33.(21+1)

=66.21+21+33.21+33

=2.33.21+33.21+21+33

=3.33.21+54

=3.3.11.21+54

=9.(10+1).21+54

=(90+9).21+54

=(100-1).21+54

=2100-21+54

=2133

16 không thấy

17 C

18 A

21 B

22 C

31 The classroom mist be cleaned by the girls everyday

32 His uncle doesn't run the business as sucessfully as he

32 The song which makes me sad is bad

Mist hay must?

C

C

* là gì nhỉ

NHÂN NHA GIUPS VS

\(=\dfrac{32}{21}\cdot\dfrac{22}{16}\cdot\dfrac{49}{45}\cdot\dfrac{5}{11}\)

\(=\dfrac{32}{16}\cdot\dfrac{22}{21}\cdot\dfrac{5}{11}\cdot\dfrac{49}{45}\)

\(=2\cdot\dfrac{49}{45}\cdot\dfrac{22}{11}\cdot\dfrac{5}{21}\)

\(=4\cdot\dfrac{49}{21}\cdot\dfrac{5}{45}=4\cdot\dfrac{1}{9}\cdot\dfrac{7}{3}=\dfrac{28}{27}\)

https://hoc24.vn/cau-hoi/a-929-135-569-b-587-319-307c-23-13-x-94-1312d-418-74-115e-47819-54-66819-54f-3221-x-4945-1622-x-1533g-2020x20189-2019x2020-2011giup-minh-voi-m.8283379351991

bn đừng đăng lại câu hỏi đã có ctrl nhé.

\(\dfrac{32}{21}\times\dfrac{49}{45}:\dfrac{16}{22}\times\dfrac{15}{33}\)

\(=\dfrac{32}{21}\times\dfrac{49}{35}\times\dfrac{22}{16}\times\dfrac{15}{33}\)

\(=\dfrac{2\times16\times7\times7\times2\times11\times3\times5}{3\times7\times5\times7\times16\times3\times11}\)

\(=\dfrac{2\times2}{3}\)

\(=\dfrac{4}{3}\)

3/22 x 33/11 x 22= 3/22 x22 x 3=3 x 3=9

3/5 x 17/21 + 17/21 + 2/5= 17/21(3/5 + 2/5)= 17/21x 1=17/21

(1/2+1/3)2/5=1/2x2/5+1/3x2/5 =1/5+2/15=1/3

wow! mù mắt. Ido tính toán có khác!

C2:(32+1)x32:2=528

bạn tính thử xem đúng đấy.

ai giup vs mk tak 5 saoooo VÀ 20 XU TL 3 BÀI MS NHẤT

a: \(13\cdot65+35\cdot12\)

\(=13\cdot65+35\cdot13-35\)

=1300-35

=1265

a: Ta có: \(345-150:\left\lbrack\left(3^3-24\right)^2-\left(-21\right)\right\rbrack+2016^0\)

\(=345-150:\left\lbrack\left(27-23\right)^2+21\right\rbrack+1\)

\(=345-150:\left(9+21\right)+1=346-150:30\)

=346-5

=341

b: Số cặp số của dãy số là:

(92-2):10+1=90:10+1=9+1=10(số)

-2+6-12+16-22+26+...-92+96

=(-2+6)+(-12+16)+(-22+26)+...+(-92+96)

=4+4+...+4

=4*10

=40