中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.已知∠A是锐角，sinA=
，则5cosA=（ ）
，则5cosA=（ ） | A: 4 |
| B: 3 |
C:  |
| D: 5 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOW3suefpeKIoEHmmK/plJDop5LvvIxzaW5BPTxpbWcgd2lkdGg9OCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GQi9FNy9yQkFDRkZObThxLVJBTFkwQUFBQkxVSHhITW81MzMucG5nIj7vvIzliJk1Y29zQT3vvIjjgIDjgIDvvIk=
- 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.在△ABC中，∠C=90°，如果sinA=，那么tanA的值为（ ）
，那么tanA的值为（ ） A:  |
| B: |
| C: |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNrnNpbkE9PGltZyB3aWR0aD04IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0ZCL0U3L3JCQUNGRk5tOHEtUkFMWTBBQUFCTFVIeEhNbzUzMy5wbmciPuiuvuWHuuWFs+S6juS4pOi+ueeahOS7o+aVsOihqOi+vuW8j++8jOWGjeagueaNruWLvuiCoeWumueQhuaxguWHuuesrOS4iei+uemVv+eahOihqOi+vuW8j+WNs+WPr+aOqOWHunRhbkHnmoTlgLwu
- 答案：QQ==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.已知sinα+cosα=m，sinα•cosα=n，则m、n的关系是（ ）
| A: m=n |
| B: m=2n+1 |
| C: m2=2n+1 |
| D: m2=1-2n |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruWQjOinkuS4ieinkuWHveaVsOeahOWFs+ezu+WPiuWujOWFqOW5s+aWueWFrOW8j+S9nOetlC4=
- 答案：Qw==
6Kej77ya4oi177yIc2luzrErY29zzrHvvIk8c3VwPjI8L3N1cD49c2luPHN1cD4yPC9zdXA+zrErY29zPHN1cD4yPC9zdXA+zrErMnNpbs6xJiM4MjI2O2Nvc86x77yMPGJyPuWPiOKItXNpbjxzdXA+Mjwvc3VwPs6xK2NvczxzdXA+Mjwvc3VwPs6xPTHvvIxzaW7OsStjb3POsT1t77yMc2luzrEmIzgyMjY7Y29zzrE9bu+8jDxicj7iiLRtPHN1cD4yPC9zdXA+PTJuKzEuIDxicj7mlYXpgIlDLiA=
本课配套习题挑战模式4/5
单选题
难度系数：
4.下列等式：①sin30°+sin30°=sin60°；②sin25°=cos65°；③cos45°=sin45°；④cos62°=sin18°. 其中正确的个数是（ ）
| A: 1个 |
| B: 2个 |
| C: 3个 |
| D: 4个 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOKRoOKRouS7o+WFpeaVsOWAvOiuoeeul+WNs+WPr+ehruWumu+8m+KRoeKRo+agueaNrumUkOinkueahOato+W8puetieS6juWug+eahOS9meinkueahOS9meW8puino+etlC4=
- 答案：Qg==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.在Rt△ABC中，∠C=90°，下列式子中不一定成立的是（ ）
A: tanA= |
| B: sin2A+sin2B=1 |
| C: sin2A+cos2A=1 |
| D: sinA=sinB |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruWQjOinkuS4ieinkuWHveaVsOeahOWFs+ezu+W8j+ebtOaOpei/m+ihjOWIpOaWreWNs+WPry4=
- 答案：RA==
6Kej77ya5qC55o2u5ZCM6KeS55qE5LiJ6KeS5Ye95pWw55qE5YWz57O777yadGFuQT08aW1nIHdpZHRoPTMyIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0ZCL0U4L3JCQUNGRk5tOHI2VFdhdktBQUFCeFM2cktGbzU5Ni5wbmciPu+8jHNpbjxzdXA+Mjwvc3VwPkErY29zPHN1cD4yPC9zdXA+QT0x77yMc2luQj1zaW7vvIg5MMKwLeKIoEHvvIk9Y29zQu+8jOWPr+efpeWPquaciUTkuI3mraPnoa4uIDxicj7mlYXpgIlELiA=
