6.4×3.3+64×0.67=64×0.33+64×0.67=64×(0.33+0.67)=64×1=64请采纳谢谢
=64x0.33+64x0.67=64x(0.33+0.67)=64x1=64
6.4x3.2+6.4x6.7=6.4x（3.2+6.7）=
