3.86-19/2+6.14-19/17
=3.86+6.14-19/2-19/17
=10-(9+1/2)-(1+2/17)
=10-9-1-1/2-2/17
= -(1/2+2/17)
= -(17/34+4/34)
= -21/34
3.86-2分之19+6.14-17分之19 怎样简算
3.86-19/2+6.14-19/17
=3.86+6.14-19/2-19/17
=10-(9+1/2)-(1+2/17)
=10-9-1-1/2-2/17
= -(1/2+2/17)
= -(17/34+4/34)
= -21/34