用简便方法计算。 5X64X25X125X2009
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5X64X25X125X2009
=5x4x2x8x25x125x2009
=5x2x4x25x8x125x2009
=10x100x1000x2009
=2009000000
=5x4x2x8x25x125x2009
=5x2x4x25x8x125x2009
=10x100x1000x2009
=2009000000
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