32×0.65+3.2×3.5=32×0.65+32×0.1×3.5=32×0.65+32×0.35=32×（0.65+0.35）=32×1=32
32×0.65+3.2×3.5=3.2×6.5+3.2×3.5=3.2×(6.5+3.5)=3.2×10=32
=32*0.65+32*0.35=32*（0.65+0.35）=32望采纳
=3.2x(6.5+3.5)=3.2x10=32
