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(1)將兩塊三角尺的直角頂點重疊在一起若∠DOB與∠DOA的度數之比為2:11,求∠BOC的度數;設∠DOB=2x,那麼:∠DOA=11x而,∠DOA=∠DOB+∠AOB=2x+90°所以:11x=2x+90°所以:x=10°且,∠BOC=90°-∠DOB=90°-2x…
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