初二数学 (北师版)
二次根式
本课配套习题挑战模式1/5
单选题
难度系数:
1.若代数式有意义,则实数x的取值范围是( )
|
A: x≠1 |
B: x≥0 |
C: x>0 |
D: x≥0且x≠1 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWIhuavjeS4jeS4ujA=
- 提示2:IOagueWPt+S4i+eahOaVsOmdnui0nw==
- 答案:RA==
6Kej77ya4oi15YiG5q+N5LiN6IO95Li6MO+8jOKItHgtMeKJoDDvvIzljbN44omgMTxicj7iiLXmoLnlj7fkuIvnmoTmlbDpnZ7otJ/iiLR44omlMDxicj7iiLR44omlMOS4lHjiiaAxPGJyPuWNs+mAiUQ8YnI+
本课配套习题挑战模式2/5
单选题
难度系数:
2.已知,则a的取值范围是( )
A: a≤0 |
B: a<0 |
C: 0<a≤1 |
D: a>0 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOmAmui/hzxpbWcgd2lkdGg9OTIgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNjgvOTcvckJBQ0ZGT1pLQXF6UTAweEFBQUNRU1pWMC1zMDIzLnBuZyI+5Ye6YeKJpTDvvIziiLXlnKjliIbmr43kuIrvvIzlj6/lvpdh77yeMA==
- 提示2:IDxpbWcgd2lkdGg9NDAgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQTQvQkYvckJBQ0UxT1pLQXJ3MVR4QUFBQUJseWtZSVYwNzI0LnBuZyI+5pyJ5oSP5LmJ77yM4oi0YeKJpDE=
- 答案:Qw==
6Kej77ya6YCa6L+HPGltZyB3aWR0aD05MiBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC82OC85Ny9yQkFDRkZPWktBcXpRMDB4QUFBQ1FTWlYwLXMwMjMucG5nIj7lh7ph4omlMO+8jOKIteWcqOWIhuavjeS4iu+8jOWPr+W+l2HvvJ4wPGJyPjxpbWcgd2lkdGg9NDAgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQTQvQkYvckJBQ0UxT1pLQXJ3MVR4QUFBQUJseWtZSVYwNzI0LnBuZyI+5pyJ5oSP5LmJ77yM4oi0YeKJpDE8YnI+4oi0MO+8nGHiiaQxPGJyPg==
本课配套习题挑战模式3/5
单选题
难度系数:
3.当m<0时,化简的结果是( )
A: -1 |
B: 1 |
C: m |
D: –m |
一次做对,真牛!
+5奖励规则>
- 提示1:IDxpbWcgd2lkdGg9MTM3IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0E0L0JGL3JCQUNFMU9aS0E2QjZwR0pBQUFDWkVlcld2MDU2Ny5wbmciPg==
- 答案:QQ==
6Kej77yaPGltZyB3aWR0aD0xMzcgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQTQvQkYvckJBQ0UxT1pLQTZCNnBHSkFBQUNaRWVyV3YwNTY3LnBuZyI+PGJyPuKItDxpbWcgd2lkdGg9NTMgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNjgvOTcvckJBQ0ZGT1pLQTZDalRLUEFBQUJzd1hiaXFNMjU1LnBuZyI+PGJyPumAiUE8YnI+
本课配套习题挑战模式4/5
单选题
难度系数:
4.化简二次根式a的结果是( )
A: |
B: |
C: |
D: |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWIpOaWreWHumErMuKJpDDvvIzlj6/lvpdh4omkLTI=
- 提示2:IGE8aW1nIHdpZHRoPTc2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0E0L0JGL3JCQUNFMU9aS0JPUUdJczRBQUFDalNCMGk0QTA0MC5wbmciPg==
- 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.若ab≠0,则等式−成立的条件是( )
A: a>0,b>0 |
B: a>0,b<0 |
C: a<0,b>0 |
D: a<0,b<0 |
一次做对,真牛!
+5奖励规则>
- 提示1:4oi1DQphYuKJoDDvvIzku47nrYnlvI/lt6bovrnliKTmlq3lh7omIzg3MjI7PGltZyB3aWR0aD01OSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9BNC9CRi9yQkFDRTFPWktCZnpvOUduQUFBQ01DaG9CSWMyODEucG5nIj4=
- 提示2:IOetieW8j+WPs+i+uTxpbWcgd2lkdGg9NzAgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjgvOTcvckJBQ0ZGT1pLQmpUT1lTSkFBQUNUaXF4YUc4MDIyLnBuZyI+
- 提示3:IOKItGLvvJww77yMYe+8njA=
- 答案:Qg==
6Kej77ya4oi1IGFi4omgMO+8jOS7juetieW8j+W3pui+ueWIpOaWreWHuiYjODcyMjs8aW1nIHdpZHRoPTU5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0E0L0JGL3JCQUNFMU9aS0Jmem85R25BQUFDTUNob0JJYzI4MS5wbmciPjxicj7iiLTnrYnlvI/lj7Povrk8aW1nIHdpZHRoPTcwIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzY4Lzk3L3JCQUNGRk9aS0JqVE9ZU0pBQUFDVGlxeGFHODAyMi5wbmciPjxicj7iiLRi77ycMO+8jGHvvJ4w