b) Ta có: \(1-\dfrac{530}{570}=\dfrac{40}{570}\)

\(1-\dfrac{531}{571}=\dfrac{40}{571}\)

mà \(\dfrac{40}{570}>\dfrac{40}{571}\)

nên \(1-\dfrac{530}{570}>1-\dfrac{531}{571}\)

\(\Leftrightarrow\dfrac{530}{570}< \dfrac{531}{571}\)

Tương tự như bài trên:

\(\dfrac{33}{131}=1-\dfrac{98}{131}< 1-\dfrac{98}{151}=\dfrac{53}{151}\)

a, vì 33<53

       131<151

=>\(\dfrac{33}{131}< \dfrac{53}{151}\)

b, Vì 530<531

       570<571

\(\Rightarrow\dfrac{530}{570}< \dfrac{531}{571}\)

\(a,\frac{-8}{15}=\frac{-8.12}{15.12}=\frac{-96}{180}\left(1\right)\)

\(\frac{7}{12}=\frac{7.15}{12.15}=\frac{105}{180}\left(2\right)\)

Từ 1 và 2 \(\Rightarrow\frac{-8}{15}< \frac{7}{12}\)

\(b,\frac{13}{19}=\frac{13.53}{19.53}=\frac{689}{1007}\left(1\right)\)

\(\frac{47}{53}=\frac{47.19}{53.19}=\frac{893}{1007}\left(2\right)\)

Từ 1 và 2 \(\Rightarrow\frac{13}{19}< \frac{47}{53}\)

mình gợi ý nhé 1 

1.  là so sánh với 1 

2 . so sánh với 0

3 . rút gọn đi rồi quy đồng lên sau đó so sánh

ta có 33/131 < 33/217< 53/217

=> 33/131< 53/217

# Linh 2k7#

trả lời 

33/131>33/132=1/4

53/217<53/212=1/4 hay 53/217<1/4<33/131

Vậy 53/217<33/131

hc tốt ~:B~ 

theo đề bài

\(\frac{53}{217}\)<\(\frac{33}{131}\)

chúc bn 

hok tốt

33 nhỏ hơn 131 và 53 nhỏ hơn 217

33 nhỏ hơn 131 và 53 nhỏ hơn 217

a. Mary is as tall as her brother.
b. A lemon is not sweet as an orange.
c. A donkey is not big as a horse.
d. This dress is as pretty as that one.
e. the weather is not cold as yesterday.
g. Mary does not sing as well as he.
h. They live as conveniently as we.
III.
1. My school is bigger than your school.
2. Lan is younger than Hoa.
3. My father is older than my mother.
4. This ruler is longer than that ruler.
5. This room is larger than my room.
6. The boys are stronger than the girls.
7. Linda cooks more terribly than her mother.
8. I do exercise more carefully than my brother.
9. He runs slowly than she. 

 II :

Mary is as tall as her brother.

A lemon is not as sweet as an orange.

A donkey is not as big as a horse.

This dress is as pretty as that one.

The weather is not as cold as yesterday.

  Mary does not sing as well as he.

 They live as conveniently as we.

`#3107.101107`

`A = 1+ 3 + 3^2+3^3+…+3^101?`

`= (1 + 3 + 3^2) + (3^3 + 3^4 + 3^5) + ... + (3^99 + 3^100 + 3^101)`

`= (1 + 3 + 3^2) + 3^3 * (1 + 3 + 3^2) + ... + 3^99 * (1 + 3 + 3^2)`

`= (1 + 3 + 3^2) * (1 + 3^3 + ... + 3^99)`

`= 13 * (1 + 3^3 + ... + 3^99)`

Vì `13 * (1 + 3^3 + ... + 3^99) \vdots 13`

`=> A \vdots 13`

Vậy, `A \vdots 13.`

Yêu cầu là gì ạ?