Bài 1: 

18/27=2/3

35/25=7/5

54/72=3/4

78/66=13/11

92/100=23/25

75/125=3/5

126/165=42/55

150/300=1/2

1717/1515=17/15

2/3       

 7/5  

3/4

13/11

23/25

3/5

42/55

1/2

17/15

95/75 = 19/15 

8/128 = 1/16

840/21 = 40

92/7 (phân số tối giản)

Chúc bạn học tốt.

😁😁😁

840/21 rút gọn thành phn 

số nào vậy

\(A=\dfrac{17^{100}+17^{96}+17^{92}+....+17^4+1}{17^{102}+17^{100}+17^{98}+....+17^2+1}\)

Gọi \(17^{100}+17^{96}+17^{92}+....+17^4+1\) là B

\(B=17^{100}+17^{96}+17^{92}+....+17^4+1\\ 17^4\cdot B=17^{104}+17^{100}+17^{96}+......+17^8+17^4\\ 17^4\cdot B-B=\left(17^{104}+17^{100}+17^{96}+......+17^8+17^4\right)-\left(17^{100}+17^{96}+17^{92}+....+17^4+1\right)\\ B\cdot\left(17^4-1\right)=17^{104}-1\\ B=\dfrac{17^{104}-1}{17^4-1}\)

Gọi \(17^{102}+17^{100}+17^{98}+....+17^2+1\) là C

\(C=17^{102}+17^{100}+17^{98}+....+17^2+1\\ C\cdot17^2=17^{104}+17^{102}+17^{100}+17^{98}+....+17^2\\ C\cdot17^2-C=\left(17^{104}+17^{102}+17^{100}+17^{98}+....+17^2\right)-\left(17^{102}+17^{100}+17^{98}+....+17^2+1\right)\\ C\cdot\left(17^2-1\right)=17^{104}-1\\ C=\dfrac{17^{104}-1}{17^2-1}\)

=>

 \(A=B:C\\ A=\dfrac{17^{104}-1}{17^4-1}:\dfrac{17^{104}-1}{17^2-1}\\ A=\dfrac{17^2-1}{17^4-1}\)

cảm ơn bạn

A = \(\dfrac{T}{M}\)

M = T + (\(17^{102}+17^{98}+17^{94}+...+17^2\))

M = T + \(17^2\left(17^{100}+17^{96}+17^{92}+...+17^0\right)\)

M = T + \(17^2\cdot\) T = T(\(1+17^2\))

=> A = \(\dfrac{T}{T\left(1+17^2\right)}=\dfrac{1}{1+17^2}\)

5/7

=\(\dfrac{5}{7}\)

5/7

b) 14/15

c)39/65

b) 14/15 ; 17/51

c) (Mình không thấy có phân số nào rút gọn được nữa)

b 14/15

c 39/65

chúc may mắn

Đáp án D

đáp án ❓ d

d

\(\frac{64}{100}=\frac{16}{25}\)

k nha

Trả lời

64/100=16/25

hok tốt

...

64/100 = 16/25

\(\dfrac{4}{100}=\dfrac{1}{25}\\ \dfrac{81}{54}=\dfrac{3}{2}\)

D

D?

D