问题
解答题
计算 (1)12-(-18)+(-7)-15 (2)4+(-2)+(-4)+1+(+2) (3)(-
(4)-
(5)(-0.125)×(-8)-[1-3×(-2)]; (6)23÷[(-2)3-(-4)]; (7)4.6-(-1
(8)
(9)-32-(-3)2+(-2)2-23 (10)(
|
答案
(1)原式=12+18-7-15=30-22=8;
(2)原式=4-2-4+1+2=1;
(3)原式=0;
(4)原式=-
+1 2
-3 4
-5 6
=2 3
=--6+9-10-8 12
;5 4
(5)原式=1-1-6=-6;
(6)原式=23÷(-8+4)=-
;23 4
(7)原式=4.6+1.2-1.64-0.75=7.85;
(8)原式=
×(-2 5
)+5 12
×8 21
-7 4
×2×1 2
=-7 2
+1 6
-2 3
=7 2
;3 8
(9)原式=-9-9+4-8=-22;
(10)原式=-3+10-4-18=-15.