问题
解答题
直接写出计算结果:
(1)(-6)+(-7)=______;
(2)(-6)-(-7)=______;
(3)(-6)+7=______;
(4)-6-7=______;
(5)-(-2)2=______;
(6)-23+(-3)2=______.
答案
(1)(-6)+(-7)=-13;
(2)(-6)-(-7)=-6+7=1;
(3)(-6)+7=-6+7=1;
(4)-6-7=-13;
(5)-(-2)2=-4;
(6)-23+(-3)2=-8+9=1.