本课配套习题挑战模式1/5
单选题
难度系数:
1.已知线段a=4,b=16,线段c是a、b的比例中项,那么c等于( )
A: 10 |
B: 8 |
C: -8 |
D: ±8 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNrue6v+auteavlOS+i+S4remhueeahOamguW/te+8jGHvvJpiPWLvvJpj77yM5Y+v5b6XYzxzdXA+Mjwvc3VwPj1hYj02NO+8jOaVhWPnmoTlgLzlj6/msYIu
- 答案:Qg==
6Kej77ya4oi157q/5q61Y+aYr2HjgIFi55qE5q+U5L6L5Lit6aG577yMPGJyPuKItGM8c3VwPjI8L3N1cD49YWI9NjTvvIw8YnI+6Kej5b6XYz3CsTjvvIw8YnI+5Y+I4oi157q/5q615piv5q2j5pWw77yMPGJyPuKItGM9OC4gPGJyPuaVhemAiUIuIA==
本课配套习题挑战模式2/5
单选题
难度系数:
2.下列各组线段,能成比例线段的是( )
A: 3cm,6cm,7cm,9cm |
B: 2cm,5cm,0.6dm,8cm |
C: 3cm,9cm,1.8dm,6cm |
D: 1cm,2cm,3cm,4cm |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWmguaenOWFtuS4reS4pOadoee6v+auteeahOS5mOenr+etieS6juWPpuWkluS4pOadoee6v+auteeahOS5mOenr++8jOWImeWbm+adoee6v+auteWPq+aIkOavlOS+i+e6v+autS4g5a+56YCJ6aG55LiA5LiA5YiG5p6Q77yM5o6S6Zmk6ZSZ6K+v562U5qGILg==
- 答案:Qw==
6Kej77yaQeOAgTPDlzniiaA2w5c377yM5pWF6ZSZ6K+v77ybPGJyPkLjgIEwLjZkbT02Y23vvIwyw5c44omgNcOXNu+8jOaVhemUmeivr++8mzxicj5D44CBMS44ZG09MThjbe+8jDPDlzE4PTbDlznvvIzmlYXmraPnoa7vvJs8YnI+ROOAgTHDlzTiiaAyw5cz77yM5pWF6ZSZ6K+vLiA8YnI+5pWF6YCJQy4g
本课配套习题挑战模式3/5
单选题
难度系数:
3.已知线段a、b、c,求作第四比例线段x,下列作图正确的是( )
A: |
B: |
C: |
D: |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruesrOWbm+avlOS+i+e6v+auteeahOWumuS5ieWIl+WHuuavlOS+i+W8j++8jOWGjeagueaNruW5s+ihjOe6v+WIhue6v+auteaIkOavlOS+i+WumueQhuWvueWQhOmAiemhueWbvuW9ouWIl+WHuuavlOS+i+W8j+WNs+WPr+W+l+inoy4=
- 答案:RA==
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
本课配套习题挑战模式4/5
单选题
难度系数:
4.已知a=2.4cm,c=5.4cm,并且a,b,b,c成比例线段,那么b=( )cm
A: 3.6 |
B: 7.2 |
C: 1.8 |
D: 6.4 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruaIkOavlOS+i+e6v+auteeahOamguW/te+8jOW+l++8mmHvvJpiPWLvvJpj77yM5YaN5qC55o2u5q+U5L6L55qE5Z+65pys5oCn6LSo77yM5b6XYjxzdXA+Mjwvc3VwPj1hY++8jOaVhWLlj6/msYIu
- 答案:QQ==
6Kej77ya4oi1YT0yLjRjbe+8jGM9NS40Y23vvIzkuJRh77yMYu+8jGLvvIxj5oiQ5q+U5L6L57q/5q6177yMPGJyPuKItGI8c3VwPjI8L3N1cD49YWM9Mi40w5c1LjTvvIw8YnI+6Kej5b6XYj3CsTMuNu+8jDxicj7iiLVi5piv57q/5q6177yM5LiN6IO95piv6LSf5pWw77yMPGJyPuKItGI9My42Y20uIDxicj7iiLTpgIlB
本课配套习题挑战模式5/5
单选题
难度系数:
5.已知各组线段的长度,下列各组中不能组成成比例线段的是()
A: 2cm,3cm,4cm,6cm |
B: 1cm,5cm,0.8cm,4cm |
C: 2.4cm,1.5cm,1.2cm,0.75cm |
D: 3cm,4cm,5cm,6cm |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWPquimgeWIpOaWreWbm+S4quaVsOS4reacgOWkp+eahOWSjOacgOWwj+eahOS4pOS4quaVsOeahOS5mOenr+etieS6juS4remXtOS4pOS4quaVsOeahOS5mOenr+WNs+WPr+WIpOaWrQ==
- 答案:RA==
6Kej562U77yaQeOAgTbDlzI9M8OXNO+8jOiDveaehOaIkOavlOS+i++8mzxicj5C44CBNMOXMT01w5cwLjjvvIzog73mnoTmiJDmr5TkvovvvJs8YnI+Q+OAgTIuNMOXMC43NT0xLjXDlzEuMu+8jOiDveaehOaIkOavlOS+i++8mzxicj5E44CBM8OXNuKJoDTDlzXvvIzkuI3og73mnoTmiJDmr5TkvosuIDxicj7mlYXpgIlELiA=