解答数学题,要清楚一点(1)如图①,在△ABC中,∠ABC、∠ACB的平分线相交于点O. 1.若∠A=60º,求∠BOC的度数. 2.若∠A=nº,则∠BOC=____3.若∠BOC=3∠A,则∠A=____ (2)如图②,在△A′B′C′中的
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