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Addition z1 + z2 = z3

作者：Steve Phelps
主題：加法
  1. Drag z1 to the origin. What do you observe?
  2. Drag z2 to the origin. What do you observe?
  3. Drag z2 to z1. What do you observe?
  4. Drag z1 to z3. What do you observe?
  5. Drag z2 to z3. What do you observe?

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