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题型:填空题 题类:模拟题 难易度:普通
贵州省黔西南州2018届九年级中考数学对点突破模拟试卷(四)
①[﹣x]=﹣[x];②若[x]=n,则x的取值范围是n≤x<n+1;③当﹣1<x<1时,[1+x]+[1﹣x]的值为1或2;④x=﹣2.75是方程4x﹣2[x]+5=0的唯一一个解.其中正确的结论有(写出所有正确结论的序号).
观察下列运算:
(+3)☆(+15) =+18 (-14)☆(-7) =+21,
(-2)☆(+14) =-16 (+15)☆(-8) =-23,
0☆(-15) =+15 (+13)☆0 =+13.
(+5)☆(+14) =+19 (-13)☆(-7) =+20,
(-2)☆(+15) =-17 (+18)☆(-7) =-25,
0☆(-19) =+19 (+13)☆0 =+13.
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