八年级下册数学暑假作业答案

八年级下册数学暑假作业答案八年级下学期数学暑假作业答案详解2017年八年级下学期数学暑假作业答案详解2017年八年级下学期数学暑假作业答案详解练习一答案：BAABAB1.解：\[=-0.5=0.5\]2.\(a-b-2a^3-a^2b\)3.\(60x^2y^2\)4.\(Y=x-\frac{1}{3}\)练习二答案：DCCDA1.122.\(3.068\times10^7\)3.\(-3.48\times10^{-5}\)4.25.106.37练习三1.\(X\geq1\)且\(X\neq2\)2.\((-1,2)\)3.\(Y=12+2x\)4.\(-2\)5.三6.答案：DCCCA练习四答案：BBCCAA1.\(y=x+5\)2.\(-2\)3.44.3练习五答案：BDCBA1.反正2.\(-5\)3.54.\(-21\)5.\(y=-\frac{x}{1}\)练习六答案：CCDAD1.\(BF=CF\),\(\angleB=\angleC\)2.33.\(120°\)4.\(8cm\)5.\(36°\)练习七答案：ADCBB1.\(\angleABC=\angleDCB\)2.\(△DCF\cong△BAE\),\(△CFO\cong△EAO\),\(△CDO\cong△ABO\)3.\(\sqrt{2}\)4.\(90°\)5.\(AD45°\)练习八答案：CCCDB1.对角线相等2.对角线互相垂直3.对角线互相垂直且相等4.\(ADBC\)5.平行四边形6.\(AB=CD\)练习九答案：CCABB1.互相垂直平分互相垂直相等2.正方正方3.\(AF=FD\)练习十1.\(90°\),\(18°\),\(252°\)2.\(1615.5\)3.略4.\(61240\)5.\(2020\%\)\(71～80\)6.\(CAACA\)练习十一1.\(2.83\)2.73.\(2(\text{平均数})S^2\)4.\(4.4\)5.\(7731.2乙\)6.\(BBCDD\)练习十二1.\(≠±12\)2.\(-x^5y^{-1}\)3.\((-1,6)\)4.\(Y=-\frac{x}{1}\)5.\(x\geq3\)且\(x\neq-0.5\)6.\(>2三\)7.\(m<\frac{3}{2}\)8.\(95°\)9.\(10\)10.\(12\)11.\(3.16\)12.\(10\)13.\(67.5°\)14.\(DBDBDBCCCB\)练习十三1.\(\frac{x^2-4}{x^2+4x+9}\)2.23.\(-5\)4.\(-7\)5.\(Y=6x-2\)6.二四增大7.18.有两个锐角互余的三角形是直角三角形真9.810.811.圆心角12.613.614.\(AB=AC\)15.\(ACDABBB\)练习十四1.22.\(3.1\times10^{-4},4.56\times10^4\)3.\((-2/3,2/5)\)4.\(\sqrt{2}\)5.\(-\frac{a}{2}b\)6.\(X=2\)7.\(\sqrt{2}\)8.\(107°\)9.\(\angleB=\angleE\)10.\(30cm\)11.312.\(CDDABDDC\)练习十五1.\(>-2\)2.\(\frac{x+y}{x^2+y^2}\)3.854.\(-6\)5.\(-\frac{3}{4}\)6.\(m<0.5\)7.减小8.