=(860+859)+(859^2-860^2)=(860+859)+(859+860)×(859-860)=(860+859)×(1+859-860)=(860+859)×0=0
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=(860+859)+(859^2-860^2)=(860+859)+(859+860)×(859-860)=(860+859)×(1+859-860)=(860+859)×0=0