本课配套习题挑战模式1/5
单选题
难度系数:
1.如图,线段CD两个端点的坐标分别为C(1,2)、D(2,0),以原点为位似中心,将线段CD放大得到线段AB,若点B坐标为(5,0),则点A的坐标为( )
A: (2,5) |
B: (2.5,5) |
C: (3,5) |
D: (3,6) |
一次做对,真牛!
+5奖励规则>
- 提示1:5Yip55So5L2N5Ly85Zu+5b2i55qE5oCn6LSo57uT5ZCI5a+55bqU54K55Z2Q5qCH5LiO5L2N5Ly85q+U55qE5YWz57O75b6X5Ye6QeeCueWdkOagh++8jg==
- 答案:Qg==
6Kej77ya4oi15Lul5Y6f54K5T+S4uuS9jeS8vOS4reW/g++8jOWcqOesrOS4gOixoemZkOWGhe+8jOWwhue6v+autUNE5pS+5aSn5b6X5Yiw57q/5q61QULvvIw8YnI+4oi0QueCueS4jkTngrnmmK/lr7nlupTngrnvvIzliJnkvY3kvLzmr5TkuLrvvJo177yaMu+8jDxicj7iiLVD77yIMe+8jDLvvInvvIw8YnI+4oi054K5QeeahOWdkOagh+S4uu+8mu+8iDIuNe+8jDXvvIk8YnI+5pWF6YCJ77yaQu+8jg==
本课配套习题挑战模式2/5
单选题
难度系数:
2.如图,以点O为位似中心,将△ABC放大得到△DEF.若AD=OA,则△ABC与△DEF的面积之比为( )
A: 1:2 |
B: 1:4 |
C: 1:5 |
D: 1:6 |
一次做对,真牛!
+5奖励规则>
- 提示1:5Yip55So5L2N5Ly85Zu+5b2i55qE5oCn6LSo6aaW5YWI5b6X5Ye65L2N5Ly85q+U77yM6L+b6ICM5b6X5Ye66Z2i56ev5q+U77yO
- 答案:Qg==
6Kej77ya4oi15Lul54K5T+S4uuS9jeS8vOS4reW/g++8jOWwhuKWs0FCQ+aUvuWkp+W+l+WIsOKWs0RFRu+8jEFEPU9B77yMPGJyPuKItE9B77yaT0Q9Me+8mjLvvIw8YnI+4oi04pazQUJD5LiO4pazREVG55qE6Z2i56ev5LmL5q+U5Li677yaMe+8mjTvvI48YnI+5pWF6YCJ77yaQu+8jg==
本课配套习题挑战模式3/5
单选题
难度系数:
3.如图,已知E(-4,2),F(-1,-1),以原点O为位似中心,按比例尺2:1把△EFO缩小,则E点对应点E′的坐标为( )
A: (2,1) |
B: |
C: (2,-1) |
D: |
一次做对,真牛!
+5奖励规则>
- 提示1:5LulT+S4uuS9jeS8vOS4reW/g++8jOaMieavlOS+i+WwujLvvJox77yM5oqK4pazRUZP57yp5bCP77yM57uT5ZCI5Zu+5b2i5b6X5Ye677yM5YiZ54K5ReeahOWvueW6lOeCuUXigLLnmoTlnZDmoIfmmK9F77yILTTvvIwy77yJ55qE5Z2Q5qCH5ZCM5pe25LmY5LulPGltZyB3aWR0aD0xOSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC85MS9DRS9yQkFDSjFXYmxqYWdpZmg5QUFBQksxNnQ0THc5NTkucG5nIj7vvIzlm6DogIzlvpfliLDnmoTngrlF4oCy55qE5Z2Q5qCH5Li677yIMu+8jC0x77yJ77yO
- 答案:Qw==
6Kej77ya5qC55o2u6aKY5oSP5Y+v55+l77yM54K5ReeahOWvueW6lOeCuUXigLLnmoTlnZDmoIfmmK9F77yILTTvvIwy77yJ55qE5Z2Q5qCH5ZCM5pe25LmY5LulPGltZyB3aWR0aD0xOSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC85MS9DRS9yQkFDSjFXYmxqYWdpZmg5QUFBQksxNnQ0THc5NTkucG5nIj48YnI+5omA5Lul54K5ReKAsueahOWdkOagh+S4uu+8iDLvvIwtMe+8ie+8jjxicj7mlYXpgInvvJpD77yO
本课配套习题挑战模式4/5
单选题
难度系数:
4.如图,△DEF与△ABC是位似图形,点O是位似中心,D、E、F分别是OA、OB、OC的中点,则△DEF与△ABC的面积比是( )
A: 1:6 |
B: 1:5 |
C: 1:4 |
D: 1:2 |
一次做对,真牛!
+5奖励规则>
- 提示1:5qC55o2u5Lik5LiJ6KeS5b2i5Li65L2N5Ly85Zu+5b2i77yM5LiU54K5T+aYr+S9jeS8vOS4reW/g++8jETjgIFF44CBRuWIhuWIq+aYr09B44CBT0LjgIFPQ+eahOS4reeCue+8jOaxguWHuuS4pOS4ieinkuW9oueahOS9jeS8vOavlO+8jOagueaNrumdouenr+S5i+avlOetieS6juS9jeS8vOavlOeahOW5s+aWueWNs+WPr+axguWHuumdouenr+S5i+avlO+8jg==
- 答案:Qw==
6Kej77ya4oi14pazREVG5LiO4pazQUJD5piv5L2N5Ly85Zu+5b2i77yM54K5T+aYr+S9jeS8vOS4reW/g++8jETjgIFF44CBRuWIhuWIq+aYr09B44CBT0LjgIFPQ+eahOS4reeCue+8jDxicj7iiLTkuKTlm77lvaLnmoTkvY3kvLzkuYvmr5TkuLox77yaMu+8jDxicj7liJnilrNERUbkuI7ilrNBQkPnmoTpnaLnp6/mr5TmmK8x77yaNO+8jjxicj7mlYXpgIlD77yO
本课配套习题挑战模式5/5
单选题
难度系数:
5.如图△ABC与△DEF是位似图形,位似比是1:2,已知DE=4,则AB的长是( )
A: 2 |
B: 4 |
C: 8 |
D: 1 |
一次做对,真牛!
+5奖励规则>
- 提示1:5Yip55So5L2N5Ly85Zu+5b2i55qE5oCn6LSo6L+b6ICM5b6X5Ye6QULnmoTplb/vvI4=
- 答案:QQ==
6Kej77ya4oi14pazQUJD5LiO4pazREVG5piv5L2N5Ly85Zu+5b2i77yM5L2N5Ly85q+U5pivMe+8mjLvvIxERT0077yMPGJyPuKItEFC55qE6ZW/5Li677yaPGltZyB3aWR0aD02IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0M3L0IxL3JCQUNFMVdibjV5ejB0LXJBQUFCSEhpa2JuWTk4MS5wbmciPsOXND0yPGJyPuaVhemAie+8mkHvvI4=