问题
解答题
计算. (1)0-(-3). (2)(-16)-(-18)-(-12)-24; (3)23-36-(-76)-(-105); (4)(-32)-87-(-72)-(-27). (5)2.75-(-8.5)-1.5-2.75. (6)(-
(7)|-23|-(-15)-|4
|
答案
(1)原式=0+3
=3;
(2)原式=(-16)+18+12+(-24)
=-16+18+12-24
=10;
(3)原式=23+(-36)+76+105
=23+76+105-36
=168;
(4)原式=(-32)+(-87)+72+27
=-119+99
=-20;
(5)原式=2.75+8.5-1.5-2.75
=11.25-4.25
=7;
(6)原式=-
+12 3
+13 4
-1.752 3
=1;
(7)原式=23+15-9
=31.