25x128x125
=25x4x8x4x125
=(25x4)x(8x125)x4
=100x1000x4
=400000
望采纳,谢谢
利用乘法结合律、128可以看成4x4x8
原式= 25x(4x4x8)x126
= 25x4x(125x8)x4
= 100x1000x4
= 100000x4
= 400000
25*4=100,8*125=1000
而128=2*2*4*8
25*4*2*2*8*125
=100*4*1000=400000
25×128×125
=25×(4×4×8)×125
=(25×4)×4×(8×125)
=100×4×1000
=400×1000
=400000
=25×4×100×4二400000