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230问答网 > 如果∠1与∠2互补，∠2与∠3互余，则∠1与∠3的关系是（） A∠1=∠3 B∠1=180°-∠3

如果∠1与∠2互补，∠2与∠3互余，则∠1与∠3的关系是（） A∠1=∠3 B∠1=180°-∠3

C∠1=90°+∠3 D以上都不对

2025-02-12 02:00:55

推荐回答（2个）

回答1：

如果∠1与∠2互补，∠2与∠3互余，则∠1与∠3的关系是（）

A∠1=∠3 B∠1=180°-∠3
C∠1=90°+∠3 D以上都不对

∠1+∠2 =180 ①
∠2+∠3 = 90 ②

①-② 得 ∠1-∠3 = 90 °
∠1=90°+∠3

选C

回答2：

∠1＋∠2=180°
∠2＋∠3=90°
相减，得
∠1-∠3=180°-90°=90°

选C

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