=(25*4)*(25*4)*13=100*100*13=130000
=25x13x(4x4)x25=25x4x25x4x13=100x100x13=10000x13=130000
=25×13×4×4×25=13×100×100=130000
25x13x16×25=25x4x25x4x13=100x100x13=10000x13=130000
