把32分成4x8,8x4x25x125=8x100x125=800x125=100000
32×25×125 =4×8×25×125 =(4×25)×(125×8)=100×1000 =100000
32×25×125=4×25×(8×125)=100×1000=100000
(4x8)x25x125=4x25+125x8=10010001100