6.4×0.25×12.5
=4×0.8×0.25×12.5
=(4×0.25)×(0.8×12.5)
=1×10
=10
=8*0.8*0.25*12.5
=0.8*12.5*8*0.25
=10*2
=20
下面那位错了
6.4X0.25X12.5
=4X0.2X8X0.25X12.5
=(4X0.25)X0.2X(8X12.5)
=1X0.2X100
=20
望采纳
谢谢
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