配套习题-用配方法解一元二次方程 -【青果学院】

本课配套习题挑战模式1/5

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单选题

难度系数：

1.把方程

+3=4x配方，得（）

A: （x-2）²=7

B: （x+2）²=21

C: （x-2）²=1

D: （x+2）²=2

提示1：55So6YWN5pa55rOV5YyW5oiQ77yIeDxpbWcgd2lkdGg9MTIgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQUEvMkEvckJBQ0ZGVElteVdCaFEtMEFBQUEwbElVMWw4NjMwLnBuZyI+Ye+8iTxzdXA+Mjwvc3VwPj1i55qE5b2i5byP
答案：Qw==
6Kej562U77ya4oi1IDxpbWcgd2lkdGg9MTcgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNzMvMUYvckJBQ0UxVElteVhoTW5Sb0FBQUJSS3VxR1c4NzIzLnBuZyI+KzM9NHg8YnI+4oi0PGltZyB3aWR0aD05NCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zRS9BQi9yQkFDSmxUSW15WGhVZ3F0QUFBQjZNYnlEb285NTcucG5nIj48YnI+5omA5Lul6YWN5pa55b6X77yIeC0y77yJPHN1cD4yPC9zdXA+PTE8YnI+PGJyPuaVhemAiUM=

本课配套习题挑战模式2/5

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单选题

难度系数：

2.将方程x

- 4x- 1=0的左边变成平方的形式是( )

A: (x- 2) =1

B: (x- 4) =1

C: (x- 2) =5

D: (x- 1) =4

提示1：5a6M5YWo5bmz5pa55YWs5byP55qE6L+Q55So
答案：Qw==
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

本课配套习题挑战模式3/5

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单选题

难度系数：

3.用配方法将二次三项式a²-4a+5变形，结果是（）

A: （a-2）²+1

B: （a+2）²-1

C: （a+2）²+1

D: （a-2）²-1

提示1：5a6M5YWo5bmz5pa55YWs5byP5Li6PGltZyB3aWR0aD0xNTUgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNzMvN0YvckJBQ0UxVEpyRTJTZmM4TEFBQUNzMFpqWG5VODc5LnBuZyI+
答案：QQ==
6Kej562U77yaYTxzdXA+Mjwvc3VwPi00YSs1PSBhPHN1cD4yPC9zdXA+LTRhKzQrMT3vvIhhLTLvvIk8c3VwPjI8L3N1cD4rMSA8YnI+5pWF6YCJQQ==

本课配套习题挑战模式4/5

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单选题

难度系数：

4.不论x、y为什么实数，代数式x²+y²+2x-4y+7的值（）

A: 总不小于2

B: 总不小于7

C: 可为任何实数

D: 可能为负数

提示1：5a6M5YWo5bmz5pa55YWs5byP5Li6PGltZyB3aWR0aD0xNTUgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvQUIvckJBQ0psVElteWlCeFZZLUFBQUNzMFpqWG5VMDEyLnBuZyI+
答案：QQ==
6Kej562U77ya4oi1eDxzdXA+Mjwvc3VwPit5PHN1cD4yPC9zdXA+KzJ4LTR5Kzc9PGltZyB3aWR0aD0xOTIgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNzMvMUYvckJBQ0UxVElteTdRV0ZzUUFBQURHdnBUbVNvMDQwLnBuZyI+PGJyPuKItOatpOW8j+WtkOeahOWAvOaAu+S4jeWwj+S6jjI8YnI+5pWF6YCJQQ==

本课配套习题挑战模式5/5

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单选题

难度系数：

5.用配方法解方程x²+4x=10的根为（）

A: 2±

B: -2±

C: -2+

D: 2-

提示1：5a6M5YWo5bmz5pa55YWs5byP5Li6PGltZyB3aWR0aD0xNTUgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNzMvN0YvckJBQ0UxVEpyRTJTZmM4TEFBQUNzMFpqWG5VODc5LnBuZyI+
答案：Qg==
6Kej562U77ya4oi1IHg8c3VwPjI8L3N1cD4rNHg9MTA8YnI+4oi0IHg8c3VwPjI8L3N1cD4rNHgrND0xNDxicj48aW1nIHdpZHRoPTEyOCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8zRi80Ny9yQkFDSjFUSnJGYlJYc2EtQUFBQ3ZjM3VIcVkwNjAucG5nIj4s5omA5Lul5Y6f5pa556iL55qE5Lik5Liq5qC55Li6PGJyPlg9LTLCsTxpbWcgd2lkdGg9MzEgaGVpZ2h0PTIzIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvM0YvMDYvckJBQ0psVEpyRmJ5dTZQbkFBQUJaTlVnX1JVNzc4LnBuZyI+PGJyPuaVhemAiUI8YnI+

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本课配套习题挑战模式1/5

本课配套习题挑战模式2/5

本课配套习题挑战模式3/5

本课配套习题挑战模式4/5

本课配套习题挑战模式5/5

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