负负为何得正的解释

  负负为何得正?

  (-3)+3=0

  (-3)x(-4)+3x(-4)=0

  (-3)x(-4)+(-12)=0

  12+(-12)=0

  所以:

  (-3)x(-4)=12

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转载自blog.csdn.net/quantum7/article/details/88785922