本课配套习题挑战模式1/3
单选题
难度系数:
1.在△ABC中,角A,B,C分别对应边为a,b,c,b=acosC,则△ABC的形状为( )
A: 等腰三角形 |
B: 直角三角形 |
C: 等边三角形 |
D: 等腰三角形或直角三角形 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOeUsWI9YWNvc0PlkozmraPlvKblrprnkIblvpdzaW5CPXNpbkFjb3ND
- 答案:Qg==
6Kej77yaYj1hY29zQ+eUseato+W8puWumueQhuW+l++8mnNpbkI9c2luQWNvc0M8YnI+4oi1Qj3PgC3vvIhBK0PvvInvvIw8YnI+4oi0c2luQj1zaW7vvIhBK0PvvIk9c2luQWNvc0M9c2luQWNvc0MrY29zQXNpbkM8YnI+4oi0Y29zQXNpbkM9MDxicj7lj4hB77yMQ+KIiO+8iDDvvIzPgO+8ie+8jDxicj7iiLRjb3NBPTDvvIxBPTxpbWcgd2lkdGg9MTggaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRkQvOTkvckJBQ0UxTlFuaF9qcjk4MEFBQUJqVm9zWmtBNzc5LnBuZyI+PGJyPuKItOKWs0FCQ+aYr+ebtOinkuS4ieinkuW9og==
本课配套习题挑战模式2/3
单选题
难度系数:
2.在△ABC中,若cosA=,则三角形的形状为( )
A: 直角三角形 |
B: 锐角三角形 |
C: 钝角三角形 |
D: 无法判断 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOW3suefpeetieW8j+W3pui+ueWIqeeUqOS9meW8puWumueQhuWMlueugO+8jOWPs+i+ueWIqeeUqOato+W8puWumueQhuWMlueugA==
- 答案:QQ==
6Kej77ya5bey55+l562J5byP5Y+Y5b2i5b6X77yaPGltZyB3aWR0aD0xMDUgaGVpZ2h0PTQ1IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRkQvOTkvckJBQ0UxTlFuaDNnaUh0NkFBQURMOFZXei1ZMDQ3LnBuZyI+IDxicj7ljrvliIbmr43lvpfvvJpiPHN1cD4yPC9zdXA+K2M8c3VwPjI8L3N1cD4tYTxzdXA+Mjwvc3VwPj0yYjxzdXA+Mjwvc3VwPu+8jDxicj7ljbNhPHN1cD4yPC9zdXA+K2I8c3VwPjI8L3N1cD49YzxzdXA+Mjwvc3VwPu+8jDxicj7liJnilrNBQkPkuLrnm7Top5LkuInop5LlvaIuIA==
本课配套习题挑战模式3/3
单选题
难度系数:
3.在△ABC中,若B=60°,2b=a+c,则△ABC的形状为()
A: 直角三角形 |
B: 等腰三角形 |
C: 等边三角形 |
D: 等腰直角三角形 |
一次做对,真牛!
+5奖励规则>
- 提示1:MeOAgeWIqeeUqOato+W8puWumueQhuWPr+W+lzJzaW5CPXNpbkErc2luQy4=
- 答案:Qw==
6Kej77ya55Sx5q2j5bym5a6a55CG5b6X77yaMnNpbkI9c2luQStzaW5D77yMPGJyPuKItUI9NjDCsO+8jDxicj7iiLRBPTEyMMKwLUM8YnI+4oi0MnNpbjYwwrA9c2lu77yIMTIwwrAtQ++8iStzaW5D77yMPGJyPuaVtOeQhuW+l++8mjxpbWcgd2lkdGg9MTQyIGhlaWdodD00NiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0ZELzk5L3JCQUNFMU5Rbmh1aktnSnZBQUFEM0ZvX0VqWTE5Ni5wbmciPu+8jDxicj7ljbNzaW7vvIhDKzMwwrDvvIk9Me+8jDxicj7iiLRDKzMwwrA9OTDCsO+8jEM9NjDCsO+8jDxicj7mlYVBPTYwwrDvvIw8YnI+4oi04pazQUJD5piv562J6L655LiJ6KeS5b2iLiA=