`22/55=(22:11)/(55:11)=2/5`
`(-63)/81 = (-63:9)/(81:9)=7/9`
`(3xx5)/(8xx24) = (3xx5)/(8xx3xx8) = 5/(8xx8)=5/64`
`(3xx5-8xx2)/16)= (3xx5-16)/16 = 3 xx 5=15`
`(2xx14)/(7xx8) = (2xx2xx7)/(7xx2xx2xx2) = 1/2`
`(11xx4-11)/(2-13) = (11xx4-11)/(-11) = (44-11)/(-11) = -3`
`(17xx5-17)/(3-20)=(17xx5-17)/(-17) = (17xx4)/(-17) = -4`
`(49+7xx49)/49 = (8xx49)/49 = 8`
____________________________________________________
Có :
`-8 < -7`
`=> -8/9 < -7/9`
Có :
`6/7 < 7/7 => 6/7 < 1`
`11/10 > 10/10 => 11/10 > 1`
`=> 6/7 < 11/10`
_________________________________________
`2/7+3/7=(2+3)/7 = 5/7`
`3/8+5/8=(3+5)/8=8/8=1`
`1/7 +(-4)/7 = 1/7-4/7 = -3/7`
`7/(-25) + 8/(-25) = -7/25 - 8/25 = -15/25 = -3/5`
`6/18 + (-14)/21 = 1/3 - 2/3 = (1-2)/3 = -1/3`
`6/13 +(-14)/39 = 18/39 - 14/39 = 4/39`
`(-3)/21 + 6/42 = -1/7+1/7=0`
`7/21 + 9/(-36)=7/21 - 9/36 = 1/3 - 1/4 = 4/12 - 3/12 = 1/12`
