15x5x25X125x64的简便方法=75x25x125x8x2x4=(75x2)x(25x4)x(125x8)=150x100x1000=15000000
=15×5×25×125×(2×4×8)=15×(5×2)×(25×4)×(125×8)=15×10×100×1000=15000000
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