如题所述
0.5×0.25×4×2
=0.5×2×0.25×4
=1×0.25×4
=0.25×4
=0.25×2×2
=0.5×2
=1
=0.5×2×0.25×4
=1×0.25×4
=0.25×4
=0.25×2×2
=0.5×2
=1
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如题所述
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