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The first day's math problem about angle
1、

DBC=∠ACB+64

∠BCE=∠ABC+64

∴∠DBC+∠BCE=∠ACB+∠ABC+64+64=244

Bo and CO are angular bisectors.

∴( 1/2)(∠dbc+∠bce)=244/2= 122

∴∠O= 180- 122=58

2、

∠DBC=∠ACB+x

∠BCE=∠ABC+x

∴∠dbc+∠bce=∠acb+∠abc+x+x= 180+x

Bo and CO are angular bisectors.

∴( 1/2)(∠dbc+∠bce)=( 180+x)/2

∴∠o= 180-( 180+x)/2=90-(x/2)