5 tháng 5 2022 lúc 22:47
`a)[-3]/4+2/7+[-1]/4+3/5+5/7`
`=([-3]/4+[-1]/4)+(2/7+5/7)+3/5`
`=[-4]/4+7/7+3/5`
`=-1+1+3/5=3/5`
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`b)6/21-[-12]/22+10/14-1/[-4]-18/33`
`=2/7+6/11+5/7+1/4-6/11`
`=(2/7+5/7)+(6/11-6/11)+1/4`
`=7/7+0+1/4`
`=1+1/4=4/4+1/4=5/4`
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