1=25x4x8x1252=100x2x4x1253=100x4x2504=100x1000=100000二三步是可以省略的,我担心孩子太小才展开的
原式=25x4x(8X125)=100X1000=100000
=25x4x8x125=(25x4)x(8x125) =100x1000=100000
nm
=25×4×8×125=(25×4)×(8×125)=100×1000=100000