Đáp án:
Giải thích các bước giải:
`e)`
`=((-5)/7+(-2)/7)+(3/4+1/4)+(-1)/5`
`=(-7)/7+4/4+(-1)/5`
`=(-1)+1+(-1)/5=0+(-1)/5=-1/5`
`f)`
`=(-5)/12+6/11+7/17+5/11+5/12`
`=((-5)/12+5/12)+(6/11+5/11)+7/17`
`=0+1+7/17=1+7/17=24/17`
`g)`
`=1/4+(-5)/13+2/11+(-8)/13+3/4`
`=(1/4+3/4)+((-5)/13+(-8)/13)+2/11`
`=4/4+(-13)/13+2/11`
`=1+(-1)+2/11=0+2/11=2/11`
`h)`
`=21/31+(-16)/7+44/53+10/31+9/53`
`=(21/31+10/31)+(44/53+9/53)+(-16)/7`
`=31/31+53/53+(-16)/7`
`=1+1+(-16)/7=2+(-16)/7=14/7+(-16)/7=-2/7`
