八下数学试卷整套及答案

八下数学试卷整套及答案一、选择题（每题3分，共30分）1.下列哪个选项是二次根式？A.\(\sqrt{a}\)B.\(\sqrt{a^2}\)C.\(\sqrt{a^2+b^2}\)D.\(\sqrt{a^2-b^2}\)2.已知\(a=2\)，\(b=-3\)，求\(a^2-b^2\)的值。A.5B.13C.25D.293.计算\(\frac{1}{2}\times\frac{3}{4}\)的结果。A.\(\frac{1}{8}\)B.\(\frac{3}{8}\)C.\(\frac{1}{4}\)D.\(\frac{3}{2}\)4.以下哪个选项是不等式\(3x-5<2\)的解？A.\(x=1\)B.\(x=2\)C.\(x=3\)D.\(x=4\)5.已知\(x=2\)，\(y=-3\)，求\(x^2+y^2\)的值。A.13B.7C.13D.256.计算\(\sqrt{16}\)的值。A.2B.4C.8D.167.以下哪个选项是不等式\(2x+3>7\)的解？A.\(x=1\)B.\(x=2\)C.\(x=3\)D.\(x=4\)8.计算\(\frac{5}{8}+\frac{3}{4}\)的结果。A.\(\frac{7}{8}\)B.\(\frac{11}{8}\)C.\(\frac{13}{8}\)D.\(\frac{15}{8}\)9.以下哪个选项是方程\(x^2-4x+4=0\)的解？A.\(x=2\)B.\(x=-2\)C.\(x=1\)D.\(x=-1\)10.计算\(\sqrt{49}\)的值。A.7B.49C.4D.2二、填空题（每题3分，共30分）11.计算\(3\times(-2)\)的结果。__________12.计算\(\frac{1}{3}\div\frac{1}{2}\)的结果。__________13.计算\(\sqrt{9}\)的值。__________14.计算\(2^3\)的值。__________15.计算\(5\times(-3)\)的结果。__________16.计算\(\frac{2}{5}\times\frac{4}{3}\)的结果。__________17.计算\(\sqrt{25}\)的值。__________18.计算\(3^2\)的值。__________19.计算\(\frac{3}{5}+\frac{2}{5}\)的结果。__________20.计算\(4^2\)的值。__________三、解答题（每题10分，共40分）21.解方程\(2x-3=7\)。22.解不等式\(5x-2<18\)。23.已知\(a=4\)，\(b=-1\)，求\(a^2-2ab+b^2\)的值。24.计算\(\sqrt{36}+\sqrt{64}\)的结果。答案一、选择题答案1.B2.B3.C4.A5.D6.B7.C8.B9.A10.C二、填空题答案11.-612.\(\frac{2}{3}\)13.314.815.-1516.\(\frac{8}{15}\)17.518.919.120.16三、解答题答案21.解：\(2x-3=7\)\(2x=7+3\)\(2x=10\)\(x=5\)22.解：\(5x-2<18\)\(5x<18+2\)\(5x<20\)\(x<4\)23.解：\(a^2-2ab+b^2\)\(=4^2-2\times4\times(-1)+(-1)^2\)\(=16+8+