(125*8)*(7*9)=1000*63=63000
125×7×8×9=(125×8)×(7×9)=1000×63=63000
125x7x8x9=25x5x7x8x9=(5x8)x(7x9)x25=40x63x25=(40x25)x63=1000x63=63000
=125×8×(7×9)=1000×63=63000