-2013的相反数是 .
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如图,两个平行四边形的面积分别为18、12,两阴影部分的面积分别为a、b(a>b),则(a-b)等于( )
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A.4
B.5
C.6
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如图,由6个形状相同的小正方体搭成的一个几何体,此几何体的左视图是( )
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A.
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B.
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C.
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D.
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若n边形的内角和是720°,则n的值是( )
A.5
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一组数据35、38、37、36、37、36、35、36的众数是( )
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把不等式组
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的解集在数轴上表示出来,正确的是( )
A.
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B.
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C.
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D.
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