3.5×98+35×0.2
=3.5×(98+2)
=3.5×100
=3503.5×98+35×0.2=3.5×(98+2)=3.5×100=350为什么变成了(98+2)不是9.8么？3.5也变成了35求解~3.5×98+35×0.2 =3.5×98+3.5×2 =3.5×(98+2) =3.5×100