本课配套习题挑战模式1/5
单选题
难度系数:
1.利用平方差公式计算(2a-5)(-2a-5)的结果是( )
A: 4a2-5 |
B: 4a2-25 |
C: 25-4a2 |
D: 4a2+25 |
一次做对,真牛!
+5奖励规则>
- 提示1:5bmz5pa55beu5YWs5byP77yIYSti77yJ77yIYS1i77yJPTxpbWcgd2lkdGg9NjEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRTUvckJBQ0oxVElsUXZBclc4VEFBQUJ5YVA4QWZJOTM1LnBuZyI+
- 答案:Qw==
6Kej562U77yaKDJhLTUpKC0yYS01KT0gKC01KzJhKSgtNS0yYSk9IDI1LTQ8aW1nIHdpZHRoPTE5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzczLzFCL3JCQUNFMVRJbFF1REY2SHZBQUFCWWtJVWxSRTk2NS5wbmciPjxicj7mlYXpgIlD
本课配套习题挑战模式2/5
单选题
难度系数:
2.计算的结果是( )
A: 18x2-2 |
B: 2-18x2 |
C: 0 |
D: 8x2 |
一次做对,真牛!
+5奖励规则>
- 提示1:5bmz5pa55beu5YWs5byP77yIYSti77yJ77yIYS1i77yJPTxpbWcgd2lkdGg9NjEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRTUvckJBQ0oxVElsUXZBclc4VEFBQUJ5YVA4QWZJOTM1LnBuZyI+
- 答案:Qw==
6Kej562U77yaPGJyPjxpbWcgd2lkdGg9MTg4IGhlaWdodD00MCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzczLzFCL3JCQUNFMVRJbFJXUzlqbGJBQUFFeVFlMkE5azQwMi5wbmciPj08aW1nIHdpZHRoPTE4MyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9BQS8yMi9yQkFDRkZUSWxSV0E1X2NUQUFBRFBpQ0xlT0UxNTAucG5nIj49PGltZyB3aWR0aD0xMzcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvQTcvckJBQ0psVElsUldqTUh6LUFBQUNObEczbFVRNTc0LnBuZyI+PTDmlYXpgIlD
本课配套习题挑战模式3/5
单选题
难度系数:
3.若x2-y2=3,则(x+y)2·(x-y)2的值是( )
A: 3 |
B: 6 |
C: 9 |
D: 18 |
一次做对,真牛!
+5奖励规则>
- 提示1:5bmz5pa55beu5YWs5byP77yIYSti77yJ77yIYS1i77yJPTxpbWcgd2lkdGg9NjEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRTUvckJBQ0oxVElsUXZBclc4VEFBQUJ5YVA4QWZJOTM1LnBuZyI+
- 提示2:5pW05L2T5Luj5YWl5oCd5oOz
- 答案:Qw==
6Kej562U77ya4oi1KHgreSk8c3VwPjI8L3N1cD7CtzxpbWcgd2lkdGg9MjM1IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNFL0U1L3JCQUNKMVRJbFJpZzNHdTVBQUFEWmk2VnVxUTgzMy5wbmciPj08aW1nIHdpZHRoPTc3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNFL0U1L3JCQUNKMVRJbFJqUkNfUEpBQUFDUEg5ZU5idzI1NS5wbmciPjxicj7iiLV4PHN1cD4yPC9zdXA+LXk8c3VwPjI8L3N1cD49Mzxicj7iiLTljp/lvI/nmoTlgLzkuLo5PGJyPuaVhemAiUM=
本课配套习题挑战模式4/5
单选题
难度系数:
4.下列各式变形后不能用平方差公式计算的是( )
A: (x-2y)(2y+x) |
B: (2-4y)(4y+2) |
C: (-2y-x)(x+2y) |
D: (-2b-5)(2b-5) |
一次做对,真牛!
+5奖励规则>
- 提示1:5bmz5pa55beu5YWs5byP77yIYSti77yJ77yIYS1i77yJPTxpbWcgd2lkdGg9NjEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRTYvckJBQ0oxVElsY3F3UWlTQ0FBQUJ5YVA4QWZJMzkzLnBuZyI+
- 答案:Qw==
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
本课配套习题挑战模式5/5
单选题
难度系数:
5.(a+b-c)(a-b+c)等于 ( )
A: a2-(b-c)2 |
B: a2+(b+c)2 |
C: (a-b)2-c2 |
D: (a+b)2-c2 |
一次做对,真牛!
+5奖励规则>
- 提示1:5bmz5pa55beu5YWs5byP77yIYSti77yJ77yIYS1i77yJPTxpbWcgd2lkdGg9NjEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRTUvckJBQ0oxVElsUXZBclc4VEFBQUJ5YVA4QWZJOTM1LnBuZyI+
- 提示2:5re75ous5Y+35Y675ous5Y+35rOV5YiZ
- 答案:QQ==
6Kej562U77ya4oi1KGErYi1jKShhLWIrYyk9PGltZyB3aWR0aD0yMDcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQUEvMjIvckJBQ0ZGVElsUkt3YkRJX0FBQURIbmh6TEM4NTg2LnBuZyI+PSBhPHN1cD4yPC9zdXA+LShiLWMpPHN1cD4yPC9zdXA+IDxicj7mlYXpgIlB