试题 试卷
题型:阅读理解 题类:常考题 难易度:普通
安徽省淮南市2020-2021学年七年级上学期数学期中试卷
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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