(-5)×(½)×3×(-2)×2简便算法

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(-5)×(½)×3×(-2)×2简便算法
(-5)×(½)×3×(-2)×2简便算法

(-5)×(½)×3×(-2)×2简便算法
(-5)×(½)×3×(-2)×2
=(-5)×(-2)×2×(½)×3
=10×1×3
=30

(-5)×(½)×3×(-2)×2
=5x3x½x2x2
=15x2
=30