试题 试卷
题型:单选题 题类:常考题 难易度:普通
内蒙古呼伦贝尔市海拉尔区第九中学2019-2020学年八年级上学期数学期末考试试卷
观察下列运算:
(+3)☆(+15) =+18 (-14)☆(-7) =+21,
(-2)☆(+14) =-16 (+15)☆(-8) =-23,
0☆(-15) =+15 (+13)☆0 =+13.
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