题目:如图,在三角形abc中,点d是ab的中点,∠dac=2∠dca,∠dcb=30度,求∠b的度数 知乎 Template




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tomski题目:如图,在三角形abc中,点d是ab的中点,∠dac=2∠dca,∠dcb=30度,求∠b的度数 知乎 coloring