Bài 1: 

a: -8/12<0<-3/-4

b: -56/24<0<7/3

c: 4/25<1<15/13

=>-4/25>-15/13

Bài 2: 

a: =-60/45=-4/3

b: =4/15-3/2-8/5=8/30-45/30-48/30=-85/30=-17/6

Câu 1:

a; x/7 = - 9/14

x = - 9/14 x 7

x = - 9/2

Vậy x = -9/2

b; - 16/36 = - y/4

-4/9 = - y/4

y = -4/9 x (-4)

y = 16/9

Vậy y = 16/9

Câu 1c:

-5/12 = x/60

x = -5/12 x 60

x = - 25

Vậy x = - 25

d: -4/8 = x/-10 = -7/y

-4/8 = x/-10

x = -4/8 x (-10)

x = 5

-4/8 = -7/y

y = - 7 : (-4/8)

y = 7 x 8/4

y = 14

Vậy (x; y) = (5; 14)

a) 1/2
b) 18/17; 17/16; 16/15; 15/14; 14/13; 13/12; 10/9
Nhớ k cho mk nha

a)1/2

b)Vì 18/17 <17/16 <16/15<15/14< 14/13< 13/12< 10/9

Nên, ta có: 

18/17; 17/16; 16/15; 15/14; 14/13; 13/12; 10/9.

a: 8/9=8/9

2/3=6/9

Do đó:8/9>2/3

b: 7/9=14/18

mà 14/18<14/17

nên 7/9<14/17

c: 9/11=81/99

7/9=77/99

mà 81>77

nen 9/11>7/9

d: 11/9=121/99

13/11=117/99

mà 121>117

nên 11/9>13/11

a) \(\dfrac{12}{14}=\dfrac{1200}{1400}=\dfrac{1400-200}{1400}=1-\dfrac{200}{1400}\)

\(\dfrac{1212}{1414}=\dfrac{1414-200}{1414}=1-\dfrac{200}{1414}\)

vì \(\dfrac{200}{1414}< \dfrac{200}{1400}\)

Nên \(1-\dfrac{200}{1400}< 1-\dfrac{200}{1414}\)

Vậy \(\dfrac{12}{14}< \dfrac{1212}{1414}\)

Các bài sau tương tự

\(\frac{23}{3}>\frac{15}{2}\)

\(\frac{14}{7}>\frac{2}{9}\)

\(\frac{12}{13}< \frac{13}{14}\)

\(\frac{17}{16}< \frac{16}{15}\)

\(\frac{8}{6}>\frac{42}{43}\)