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.已知x=,则的值为( )
A: 2 |
B: 2 |
C: |
D: |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWFiOWMlueugOS7o+aVsOW8j++8jOWGjeaKinjnmoTlgLzku6PlhaXorqHnrpcu
- 答案:Qg==
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
本课配套习题挑战模式2/5
单选题
难度系数:
2.已知xy=,x-y=-1,则(x+1)(y-1)的值为( )
A: 6 |
B: -4 |
C: 6 |
D: 无法确定 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWFiOaKiuimgeaxgueahOW8j+WtkOi/m+ihjOWPmOW9ou+8jOW+l+WHuu+8iHgrMe+8ie+8iHktMe+8iT14eS3vvIh4LXnvvIktMTs=
- 提示2:IOaKinh5PTxpbWcgd2lkdGg9MTkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQTQvQzAvckJBQ0UxT1pLSExoZ0NhU0FBQUJlMFhPWHFzNzIzLnBuZyI+77yMeC15PTxpbWcgd2lkdGg9MjggaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQTQvQzAvckJBQ0UxT1pLSGFqWnZNOUFBQUJwRHVLRUpBOTQwLnBuZyI+LTHku6PlhaXljbPlj68=
- 答案:Qg==
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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a=,b=,则的值为( )
A: 3 |
B: 4 |
C: 5 |
D: 6 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOacrOmimOWPr+WwhmHjgIFi55qE5YC85Luj5YWl77yM5YyW566A5qC55byP5Lit55qE5pWw77yM5YaN5byA5qC55Y+35Y2z5Y+vLg==
- 答案:Qw==
6Kej77ya5Y6f5byPPTxpbWcgd2lkdGg9MTcyIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0E0L0MwL3JCQUNFMU9aS0dxeVB0RE9BQUFETWxYQzdTczkyOC5wbmciPjxicj49PGltZyB3aWR0aD0xNzQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNjgvOTgvckJBQ0ZGT1pLR3J4LWVIRkFBQUN1UUlBZGdRNDYxLnBuZyI+PGJyPj01PGJyPumAiUM8YnI+
本课配套习题挑战模式4/5
单选题
难度系数:
4.已知:a=3−,b=3+,,则代数式(3a2-18a+15)(2b2-12b+13)的值是( )
A: 6 |
B: 24 |
C: 42 |
D: 96 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOeUseW3suefpeWPmOW9ouW+l2E8c3VwPjI8L3N1cD4tNmE9LTfvvIxiPHN1cD4yPC9zdXA+LTZiPS0377yM5YaN5pW05L2T5Luj5YWl6K6h566XLg==
- 答案:QQ==
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
本课配套习题挑战模式5/5
单选题
难度系数:
5.
已知实数x,y满足x+y=-2a,xy=a(a≥1),则的值为( )
A: |
B: 2a |
C: a |
D: 2√a |
一次做对,真牛!
+5奖励规则>
- 提示1:PHA+6aaW5YWI5qC55o2u5LqM5qyh5qC55byP55qE5oCn6LSo5YyW566APGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzY4L0RFL3JCQUNGRk9aTzBfaUJ1UUxBQUFDYkJiLXFsVTQ0NS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjgvREUvckJBQ0ZGT1pPMF9pQnVRTEFBQUNiQmItcWxVNDQ1LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjUxIj48L3A+
- 提示2:PHA+5YaN6L+b5LiA5q2l5Luj5YWl5rGC5b6X5pWw5YC85Y2z5Y+vPC9wPg==
- 答案:RA==
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