a)
x = `2017/2018 = 26221/ 26234` ; y = `14/13 = 28252/26234`
`=> x < y`
b)
` x = -45/84 = -44955` ; `y = 777/ -999 = -65268/ 83916`
`=> x > y`
c)
` x = \(-2\dfrac{1}{5}\)= -2, 2 ` ; `y = -100 / 50 = -2`
`=> x < y`
d)
`x = 17/20 = 0,85` ; 0,75 = 0,75
`=> x>y`
a)


=> x < y
b)


Do -135 > -196

Vậy x > y
c)


Do -11 < -10

Vậy x < y
d)

Do 17 > 15

Vậy x > y