问题
解答题
计算下列各式: (1)2+(-8)-(-3); (2)2-2÷
(3)25×
(4)-22×|-
|
答案
(1)2+(-8)-(-3),
=2-8+3,
=5-8,
=-3;
(2)2-2÷
×3,1 3
=2-2×3×3,
=2-18,
=-16;
(3)25×
-(-25)×3 4
+25×(-1 2
),1 4
=25×
+25×3 4
-25×1 2
,1 4
=25×(
+3 4
-1 2
),1 4
=25×1,
=25;
(4)-22×|-
|+8÷(-2)2,1 2
=-4×
+8÷4,1 2
=-2+2,
=0.