Đáp án:
Bài 1
`a)`
` 1/2 = (1.114)/(2.114) = 114/228`
`1/3 = (1.76)/(3.76) = 75/228`
` 1/38 = (1.6)/(38.6) = 6/228`
` -1/12 = (-1.19)/(12.19) = -19/228`
`b)`
` 9/30 = 3/10 = 60/200`
` 98/80 = 49/40 = 245/200`
` 15/1000 = 3/200`
Bài `2`
`a)`
` 3/-20 = -9/60`
` -11/-30 = 22/60`
` 7/15 = 28/60`
`b)`
` -6/35 = -216/1260`
` 27/-180 = -49/1260`
` -3/-28 = 135/1260`