(-11/2)-(-22/3)-(+21/5)-20/3 =(-11/2-21/5)-(-22/3+20/3) =-97/10+2/3 =-271/10 =-27.1 16-(-25/3)-(+14/3) =16+(25/3-14/3) =16+11/3 =19又2/3
(-11/2)-(-22/3)-(+21/5)-20/3= 16-(-25/3)-(+14/3)
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