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∠B=97.5°,∠D=82.5° ∵在四邊形ABCD中 內角和=360° ∴∠A+∠B+∠C+∠D=360° ∵∠A+∠C=180° ∴∠B+∠D=180° ∵∠B=∠D+15° ∴∠D+15°+∠D=180° ∠D=82.5° ∠B=82.5°+15°=97.5°
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