2012年湖北省黄冈市中考数学试卷
2012年湖北省黄冈市中考数学试卷一、选择题(本题个8个小题,每小题3分,共24分)1.(3分)下列实数中是无理数的是( )A.B.C.π0D.2.(3分)2012年5月25日有700多位来自全国各地的知名企业家聚首湖北共签约项目投资总额为909260000000元,将909260000000用科学记数法表示为表示(保留3个有效数字),正确的是( )A.909×1010B.9.09×1011C.9.09×1010D.9.0926×10113.(3分)下列运算正确的是( )A.x4•x3=x12B.(x3)4=x81C.x4÷x3=x(x≠0)D.x4+x3=x74.(3分)如图,水平放置...
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