本课配套习题挑战模式1/5
单选题
难度系数:
1.如图,在三角形纸片ABC中,∠A=65°,∠B=75°,将纸片的一角折叠(折痕为DE),使点C落在△ABC内的C′处,若∠AEC′=20°,则∠BDC′的度数是( )
A: 30° |
B: 40° |
C: 50° |
D: 60° |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruinhumikeiusuino+WGheWuue+8jOWPr+W/q+mAn+W+l+WHug==
- 答案:RA==
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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,∠A=65°,∠B=75°,将纸片的一角折叠,使点C落在△ABC内,若∠2=20°,则∠1的度数为( )
A: 30° |
B: 45° |
C: 60° |
D: 无法确定 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruinhumikeS4reeahOiusuino++8jOWPr+W/q+mAn+ino+W+lw==
- 答案:Qw==
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本课配套习题挑战模式3/5
单选题
难度系数:
3.如图三角形的顶点落在折叠后的四边形内部,则∠γ与∠α+∠β之间的关系是( )
A: ∠γ=∠α+∠β |
B: 2∠γ=∠α+∠β |
C: 3∠γ=2∠α+∠β |
D: 3∠γ=2(∠α+∠β) |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruinhumikeS4reeahOiusuino+W/q+mAn+W+l+WHug==
- 答案:Qg==
6Kej77ya5aaC5Zu+77yM4oigMSviiKAyPTE4MMKwLeKIoM6z77yMPGJyPuKIteS4ieinkuW9oueahOmhtueCueiQveWcqOaKmOWPoOWQjueahOWbm+i+ueW9ouWGhemDqO+8jDxicj7iiLTiiKDOsSsy4oigMSviiKDOsisy4oigMj0xODDCsMOXMu+8jDxicj7ljbPiiKDOsSviiKDOsisy77yI4oigMSviiKAy77yJPTM2MMKw77yMPGJyPuKItOKIoM6xK+KIoM6yKzM2MMKwLTLiiKDOsz0zNjDCsO+8jDxicj7iiLQy4oigzrM94oigzrEr4oigzrIuIDxicj48aW1nIHdpZHRoPTEyMyBoZWlnaHQ9MTI0IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMkEvRkUvckJBQ0UxTmdjVC1oSmoyTkFBQVF6aUxGcjFVMDA3LnBuZyI+
本课配套习题挑战模式4/5
单选题
难度系数:
4.如图,把△ABC纸片沿DE折叠,当点A落在四边形BCDE内部时,则∠A与∠1,∠2之间的数量关系是( )
A: ∠A=∠1+∠2 |
B: ∠A=∠2-∠1 |
C: 2∠A=∠1+∠2 |
D: 3∠A=2(∠1+∠2) |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWPr+i/nuaOpUFB4oCy77yM5YiG5Yir5Zyo4pazQUVB4oCy44CB4pazQURB4oCy5Lit77yM5Yip55So5LiJ6KeS5b2i55qE5aSW6KeS5oCn6LSo6KGo56S65Ye64oigMeOAgeKIoDLvvJvkuKTogIXnm7jliqDogZTnq4vmipjlj6DnmoTmgKfotKjljbPlj6/lvpfliLDmiYDmsYLnmoTnu5Porro=
- 答案:Qw==
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本课配套习题挑战模式5/5
单选题
难度系数:
5.如图,在折纸活动中,小明制作了一张△ABC纸片,点D、E分别是边AB、AC上,将△ABC沿着DE折叠压平,A与A′重合,若∠A=75°,则∠1+∠2=( )
A: 150° |
B: 210° |
C: 105° |
D: 75° |
一次做对,真牛!
+5奖励规则>
- 提示1:IOe/u+aKmOWJjeWQju+8jOacieinkuW6puebuOetiQ==
- 提示2:IDxpbWcgd2lkdGg9MjcwIGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0VFL0YyL3JCQUNGRk5nY1BUQ3Q1VzhBQUFEZzdfWC13YzM4OC5wbmciPg==
- 答案:QQ==
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