63×6.4+3.6×64=63×6.4+36×0.1×64=63×6.4+36×6.4=(63+36)×6.4=99×6.4=(100-1)×6.4=100×6.4-1×6.4=640-6.4=633.6
63x6.4+3.6x64=64x(6.3+3.6)=64x9.9=64x10-64x0.1=64-6.4=60-2.4=57.6以上就是简便计算过程。