试题 试卷
题型:综合题 题类:常考题 难易度:普通
重庆市巴南区2020届九年级上学期数学期中考试试卷
(+5)☆(+14) =+19 (-13)☆(-7) =+20,
(-2)☆(+15) =-17 (+18)☆(-7) =-25,
0☆(-19) =+19 (+13)☆0 =+13.
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