题目内容
(+5)+(+7)=_______;
(-3)+(-8)=_______;
(+3)+(-8)=_______;
(-3)+(-15)=_______;
0+(-5)=________;
(-7)+(+7)=_______.
12 -11 -5 -18 -5 0
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题目内容
(+5)+(+7)=_______;
(-3)+(-8)=_______;
(+3)+(-8)=_______;
(-3)+(-15)=_______;
0+(-5)=________;
(-7)+(+7)=_______.
12 -11 -5 -18 -5 0