已知∠boc在∠aob的外部,oe平分∠aob,of平分∠boc,od平分∠aoc,∠aoe=30°,∠bod=20°,试求∠cof
已知∠boc在∠aob的外部,oe平分∠aob,of平分∠boc,od平分∠aoc,∠aoe=30°,∠bod=20°,试求∠cof
数学人气:874 ℃时间:2020-01-28 05:01:24
优质解答
画一下图可能清楚一些.aoe=30bod=20oe平分aoe=eob=30of平分bocbof=focod平分aoeaod=codeod=eob-bod=10od平分aocaod=dac=aoe+eod=40aoc=2*aod=80oe平分aobaob=2*aoe=60boc=aoc-aob=20of平分boccof=bof=1/2*boccof=10...
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