兴化数学试卷初二下册

一、选择题（每题2分，共20分）
1. 下列各数中，有理数是（）
A. $\sqrt{3}$
B. $\pi$
C. $\frac{1}{2}$
D. $\sqrt{2} - \sqrt{3}$
2. 已知a、b是方程$2x^2 - 3x + 1 = 0$的两根，则a+b的值为（）
A. 2
B. 3
C. $\frac{3}{2}$
D. 1
3. 在下列函数中，是反比例函数的是（）
A. $y = x^2 + 1$
B. $y = 2x + 1$
C. $y = \frac{1}{x}$
D. $y =
\sqrt{x}$
4. 已知一次函数$y = kx + b$中，$k = 2$，$b = -1$，则函数的图像是（）
A. 上升的直线
B. 下降的直线
C. 平行于x轴的直线
D. 平行于y轴的直线
5. 已知三角形的三边长分别为3，4，5，则该三角形是（）
A. 等腰三角形
B. 等边三角形
C. 直角三角形
D. 钝角三角形
6. 在下列各式中，正确的是（）
A. $a^2 + b^2 = c^2$
B. $a^2 - b^2 = c^2$
C. $a^2 + c^2 = b^2$
D. $a^2 + b^2 = a^2 + c^2$
7. 下列各式中，绝对值最小的是（）
A. |-3|
B. |3|
C. |-5|
D. |5|
8. 已知a，b是方程$2x^2 - 3x + 1 = 0$的两根，则$\frac{1}{a} +
\frac{1}{b}$的值为（）
A. 2
B. $\frac{3}{2}$
C. 1
D. $\frac{1}{2}$
9. 在下列各式中，正确的是（）
A. $a^2 \cdot b^2 = (ab)^2$
B. $a^2 + b^2 = (a+b)^2$
C. $a^2 - b^2 = (a+b)(a-b)$
D. $a^2 + b^2 = (a-b)^2$
10. 已知a，b是方程$2x^2 - 3x + 1 = 0$的两根，则$\sqrt{a^2 + b^2}$的值为（）
A. 2
B. $\frac{3}{2}$
C. 1
D. $\frac{1}{2}$
二、填空题（每题2分，共20分）
11. 若$\sqrt{3} + \sqrt{2} = a$，则$\sqrt{3} - \sqrt{2} =
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