中考数学得分专练11一、填空题(本题共8个小题,每小题3分,满分24分)1、-8的绝对值是.2、函数y=2x中的自变量x的取值范围是.3、△ABC中,∠A=55,∠B=25,则∠C=.4、方程112x的解为x=.5、如图,P为菱形ABCD的对角线上一点,PE⊥AB于点E,PF⊥AD于点F,PF=3cm,则P点到AB的距离是cm.(第5题)(第6题)6、如图,在Rt△ABC中,∠C=90,AB=10cm,D为AB的中点,则CD=cm.7、已知a、b为两个连续整数,且a<7<b,则ba=.8、在一次捐款活动中,某班50名同学人人拿出自己的零花钱,有捐5元、10元、20元的,还有捐50元和100元的。右边的统计图反映了不同捐款数的人数比例,那么该班同学平均每人捐款元.二、选择题(本题共8个小题,每小题3分,满分24分)请将你认为正确的选项的代号填在下面的表格里:题号910111213141516答案9、下面计算正确的是()A、221B、24C、(3nm)2=6nmD、426mmm10、要反映长沙市一周内每天的最高气温的变化情况,宜采用()A、条形统计图B、扇形统计图C、折线统计图D、频数分布直方图11、若点P(a,a4)是第二象限的点,则a必须满足()ABCDABCDEFP(第8题)20元44%10元20%50元16%100元12%5元8%A、a<4B、a>4C、a<0D、0<a<412、如图是每个面上都有一个汉字的正方体的一种展开图,那么在正方体的表面,与“迎”相对的面上的汉字是()A、文B、明C、奥D、运13、在同一平面直角坐标系中,函数xy1与函数xy的图象交点个数是()A、0个B、1个C、2个D、3个14、在同一时刻,身高1.6米的小强在阳光下的影长为0.8米,一棵大树的影长为4.8米,则树的高度为()A、4.8米B、6.4米C、9.6米D、10米15、如图,P为⊙O外一点,PA切⊙O于点A,且OP=5,PA=4,则sin∠APO等于()A、54B、53C、34D、43(第15题)(第16题)16、二次函数cbxaxy2的图象如图所示,则下列关系式不正确的是()A、a<0B、abc>0C、cba>0D、acb42>0三、解答题(本题共6个小题,每小题6分,满分36分)17、计算:0)151(30sin2273.18、先化简,再求值:aaa21422,其中21a.讲文明迎奥运(第12题)POA·..一、填空题1、82、x≥23、1004、35、36、57、58、31.2二、选择题题号910111213141516答案DCCAACBC三、解答题17.原式=3+2×21-1··················································································(3分)=3+1-1·······················································································(4分)=3······························································································(6分)18.原式=21222aaaa····································································(2分)=2222aaaa=222aaa·······································································(3分)=21a·····························································································(4分)当21a时,原式=52.········································································(6分)