本课配套习题挑战模式1/5
单选题
难度系数:
1.如图,AD是△ABC的角平分线,点O在AD上,且OE⊥BC于点E,∠BAC=60°,∠C=80°,则∠EOD的度数为( )
A: 20° |
B: 30° |
C: 10° |
D: 15° |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruinhumikeS4reS+i+mimOeahOiusuino+WPr+W/q+mAn+W+l+WHug==
- 答案:QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数:
2.如图,已知AF平分∠BAC,过F作FD⊥BC,若∠B比∠C大20度,则∠F的度数是( )
A: 10° |
B: 15° |
C: 20° |
D: 不能确定 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruinhumikeS4reS+i+mimOeahOiusuino+WPr+W/q+mAn+W+l+WHug==
- 答案:QQ==
6Kej77ya4oi14oigQuavlOKIoEPlpKcyMOW6pu+8jDxicj7iiLTiiKBCPTIwwrAr4oigQ++8jDxicj7iiLVBRuW5s+WIhuKIoEJBQ++8jDxicj7iiLTiiKBFQUM94oigQkFG77yMPGJyPuKIteKIoEFEQyviiKBCQUYr4oigQi0yMMKwPTE4MMKw77yMPGJyPuKIoEFEQz3iiKBCK+KIoEJBRu+8jDxicj7lvpflh7riiKBCQUYr4oigQj0xMDDCsO+8jDxicj7iiLTiiKBBREM9MTAwwrDvvIw8YnI+4oi1RkTiiqVCQ++8jDxicj7iiLTiiKBBREM9OTDCsCviiKBGPTEwMMKw77yMPGJyPuKItOKIoEY9MTDCsC4g
本课配套习题挑战模式3/5
单选题
难度系数:
3.如图,△ABC中,AB=AC,D是BC上一点,且BD=BA. 连接AD,若∠ADB=α,∠CAD=β,则α,β满足的关系是( )
A: α+β=90° |
B: 2α+β=180° |
C: 3α-β=180° |
D: α+3β=180° |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruS4ieinkuW9ouWGheinkuWSjOWumueQhuWSjOS4ieinkuW9ouWkluinkueahOaAp+i0qO+8jOWNs+WPr+axguinow==
- 答案:Qw==
6Kej77ya4oi1QkQ9QkHvvIw8YnI+4oi04oigQkFEPc6x77yMPGJyPuKItOKWs0FCQ+S4re+8jM6yK+KIoEMr4oigQkFEK+KIoEI9MTgwwrDvvIw8YnI+4oi1QUI9QUPvvIw8YnI+4oi04oigQj3iiKBD77yMPGJyPuKItc6xPc6yK+KIoEPvvIw8YnI+4oi0zrIrzrEtzrIrzrEtzrIrzrE9MTgwwrDvvIw8YnI+4oi0M86xLc6yPTE4MMKwLiA=
本课配套习题挑战模式4/5
单选题
难度系数:
4.如图,△ABC中,∠A=35°,∠B=75°,CE平分∠ACB,CD⊥AB于D,则∠ECD为( )
A: 20° |
B: 35° |
C: 15° |
D: 25° |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruS4ieinkuW9ouWGheinkuWSjOWumueQhuiuoeeul+WHuuKIoEFDQuWSjOKIoERDQueahOW6puaVsO+8jOWGjeWIqeeUqOinkuW5s+WIhue6v+eahOaAp+i0qOiuoeeul+WHuuKIoEVDQueahOW6puaVsA==
- 答案:QQ==
6Kej77ya4oi14oigQT0zNcKw77yM4oigQj03NcKw77yMPGJyPuKItOKIoEFDQj0xODDCsC0zNcKwLTc1wrA9NzDCsO+8jDxicj7iiLVDReW5s+WIhuKIoEFDQu+8jDxicj7iiLTiiKBFQ0I9MzXCsO+8jDxicj7iiLVDROKKpUFC5LqORO+8jDxicj7iiLTiiKBDREI9OTDCsO+8jDxicj7iiLTiiKBEQ0I9MTgwwrAtOTDCsC03NcKwPTE1wrDvvIw8YnI+4oi04oigRUNEPTM1wrAtMTXCsD0yMMKwLiA=
本课配套习题挑战模式5/5
单选题
难度系数:
5.如图,△ABC中,点D为BC上一点,且AB=AC=CD,则图中∠1和∠2的关系是( )
A: ∠2=2∠1 |
B: ∠1+2∠2=90° |
C: 2∠1+3∠2=180° |
D: 3∠1+2∠2=180° |
一次做对,真牛!
+5奖励规则>
- 提示1:IOe7k+WQiOWGheinkuWSjOS4juWkluinkuaAp+i0qA==
- 答案:Qw==
6Kej77ya4oi1QUI9QUM9Q0TvvIw8YnI+4oi04oigMj3iiKBD77yM4oigQURDPeKIoENBRO+8jDxicj7lj4jiiLUy4oigQURDPTE4MMKwLeKIoEM9MTgwwrAt4oigMu+8jOKIoEFEQz3iiKAxK+KIoDLvvIw8YnI+4oi0Mu+8iOKIoDEr4oigMu+8iT0xODDCsC3iiKAy77yMPGJyPuWNszLiiKAxKzPiiKAyPTE4MMKw