深圳市桃苑学校小学九年级数学一元二次方程检测题

<div><strong>一、填空题(每空3分,共24分)</strong>&nbsp;</div><div><br></div><div>1.方程化为一般形式是 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;。</div><div><br></div><div>2.如果一个一元二次方程的二次项系数为,一次项系数为,常数项为,且=2,</div><div><br></div><div>=-4,=-7,那么这个一元二次方程是_ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; _。</div><div><br></div><div>3.当_____时,方程是关于的一元一次方程,</div><div><br></div><div>当 &nbsp; &nbsp; &nbsp; &nbsp; 时,方程是关于的一元二次方程。</div><div><br></div><div>4.若关于的方程有一个根为1,则_____;若这个方程的两个实数根相等,则_____。</div><div><br></div><div>5.若把一个正方形的一边增加2 cm,把另一边增加1 cm,所得的矩形比正方形面积多</div><div><br></div><div>14 cm2,那么原来得正方形边长为_____cm。</div><div><br></div><div><strong>6.一元二次方程 的求根公式是 &nbsp;</strong> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;。</div><div><br></div><div>二、选择题(每小题3分,共12分)</div><div><br></div><div>7.方程的左边配成完全平方式后所得的方程是(  )A. &nbsp; &nbsp; B. &nbsp; &nbsp;C. &nbsp; &nbsp; &nbsp;D. 以上答案都不对</div><div><br></div><div>8. 方程的两个根是(  )A. 1和 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B.-2和 &nbsp; &nbsp; &nbsp; &nbsp; C. 2和 &nbsp; &nbsp; &nbsp; &nbsp; D.-2和</div><div><br></div><div>9. 某工厂元月份生产机器100台,计划二、三月份共生产250台,设二、三月份的生产平均增长率为,则根据题意列出的方程是( &nbsp; &nbsp; )</div><div><br></div><div>A. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B.&nbsp;</div><div><br></div><div>C. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D.&nbsp;</div><div><br></div><div>10. 关于的一元二次方程的一个根为0,则( &nbsp; &nbsp;)</div><div><br></div><div>A. &nbsp; &nbsp; &nbsp; &nbsp; B. &nbsp; &nbsp; &nbsp; &nbsp;C.或-1 &nbsp; &nbsp; &nbsp; D.</div><div><br></div><div><strong>三、解下列方程(11-16,每题6分,第17题每问4分)</strong></div><div><br></div><div>(11) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (12)&nbsp;</div><div><br></div><div>(13) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (14)&nbsp;</div><div><br></div><div>(15) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(16)</div><div><br></div><div>(17)已知方程的两个根分别是,,</div><div><br></div><div>求:①,②,③,④,⑤</div><div><br></div><div><strong>四、应用题(8分)&nbsp;</strong></div><div><br></div><div>新新商店以16元/支的价格进了一批钢笔,如果以20元/支的价格售出,每月可以卖出200支,而每上涨1元就少卖10支,现在商店店主希望该笔月利润达1350元,求这种钢笔应该上涨多少元,此时能售出多少支?</div><div><br></div><div><br></div><div><strong>点击此处下载完整版:</strong><a href="//www.szxuexiao.com/down.asp?fileurl=201208_275921_057614216" target="_blank">深圳市桃苑学校小学九年级数学一元二次方程检测题</a></div><div><br></div>