51.2X48X5.12X520怎样简便方法计算的方法?
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51.2×48×5.12×520
=(51.2×51.2)×(48×52)
=(50+1.2)²×(50+2)×(50-2)
=(2500+2×50×1.2+1.2×1.2)×(2500-4)
=(2500+120+1.44)×(2500-4)
=2621.44×2500-2621.44×4
=655.36×4×2500-10485.76
=6553600-10485.76
=6553000-10000+(600-485.76)
=6543114.24
=(51.2×51.2)×(48×52)
=(50+1.2)²×(50+2)×(50-2)
=(2500+2×50×1.2+1.2×1.2)×(2500-4)
=(2500+120+1.44)×(2500-4)
=2621.44×2500-2621.44×4
=655.36×4×2500-10485.76
=6553600-10485.76
=6553000-10000+(600-485.76)
=6543114.24
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51.2×48+5.12×520
=5.12×480+5.12×520
=5.12×(480+520)
=5.12×1000
=5120
=5.12×480+5.12×520
=5.12×(480+520)
=5.12×1000
=5120
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