问题
填空题
直接写出结果:
(1)(-9)+(+4)=______;
(2)(-9)-(+4)=______;
(3)(-9)×(+4)=______;
(4)(-9)÷(+4)=______.
答案
(1)(-9)+(+4)=-5;
(2)(-9)-(+4)=-9+(-4)=-13;
(3)(-9)×(+4)=-36;
(4)(-9)÷(+4)=-
.9 4
故答案为-5;-13;-36;-
.9 4