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∠A+∠B=2∠C=180°-∠C 所以∠C=60° ∠A-∠C=40° 所以∠A=100°,∠B=20° 所以是鈍角三角形. 很高興為您答題,祝學習進步!有不明白的可以追問! 如果有其他需要幫助的題目,您可以求助我.望採納,謝謝!
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