72*32+14*64=36*2*32+14*64=36*64+14*64=64*(36+14)=64*50=3200
72×32+14×64=72×32+(14×2)×32=(72+28)×32=3200
72×32+14×64=72×32+14×2×32=72×32+28×32=32×(72+28)=32×100=3200
72x32+14x64的简便运算方法是:72x32+14x2x32=32x(72+14x2)=32x(72+28)=32x100=3200