2012年湖北省黄石市中考数学试卷
2012年湖北省黄石市中考数学试卷一、仔细选一选(本题有10个小题,每小题3分,共30分)下面每个小题给出的四个选项中,只有一个是正确的,请把正确选项所对应的字母在答题卡中相应的格子涂黑,注意可用多种不同的方法来选取正确答案.1.(3分)﹣的倒数是( )A.B.3C.﹣3D.﹣2.(3分)某星球的体积约为6635421km3,用科学记数法(保留三个有效数字)表示为6.64×10nkm3,则n=( )A.4B.5C.6D.73.(3分)已知反比例函数y=(b为常数),当x>0时,y随x的增大而增大,则一次函数y=x+b的图象不经过第几象限.( )A.一B.二C.三D.四4.(3分)2012...
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