Giúp mik bài 2 nhanh nha
`2/3 xx 4/5 xx 6/7`
`=(2xx4xx6)/(3xx5xx7)`
`=48/105`
`=16/35`
____________________________
`2/7 xx 5`
`=(2xx5)/7`
`=10/7`
____________________________
`4 xx 2/9`
`=(4xx2)/9`
`=8/9`
____________________________
`1/3 : 3/4`
`=1/3 xx 4/3`
`=(1xx4)/(3xx3)`
`=4/9`
______________________________
`6/7 : 3`
`=6/7 xx 1/3`
`=(6xx1)/(7xx3)`
`=6/21`
`=2/7`
__________________________
`8 : 4/5`
`=8 xx 5/4`
`=(8xx5)/4`
`=40/4`
`=10`
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