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1个回答
2014-08-11
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证明:∵AD平分∠BAC
∴∠BAD=∠BAC/2
∵BE平分∠ABC
∴∠ABE=∠ABC/2
∴∠AHE=∠BAD+∠ABE
=(∠BAC+∠ABC)/2
=(180-∠ACB)/2=90-∠ACB/2
∵CF平分∠ACB
∴∠ACF=∠ACB/2
∵HG⊥AC
∴∠CHG+∠ACF=90
∴∠CHG=90-∠ACF=90-∠ACB/2
∴∠AHE=∠CHG
∴∠BAD=∠BAC/2
∵BE平分∠ABC
∴∠ABE=∠ABC/2
∴∠AHE=∠BAD+∠ABE
=(∠BAC+∠ABC)/2
=(180-∠ACB)/2=90-∠ACB/2
∵CF平分∠ACB
∴∠ACF=∠ACB/2
∵HG⊥AC
∴∠CHG+∠ACF=90
∴∠CHG=90-∠ACF=90-∠ACB/2
∴∠AHE=∠CHG
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