问题
解答题
计算: (1)2×(-3)2-4×(-2)+10; (2)(-30)×(
(3)-14-(2.5-2)×
|
答案
(1)原式=2×9+8+10
=18+8+10
=36;
(2)原式=-30×
+30×1 3
+30×5 6 3 10
=-10+25+9
=24;
(3)原式=-1-
×1 2
[4+1)]1 4
=-1-
×1 2
×51 4
=-1-5 8
=-
.13 8
计算: (1)2×(-3)2-4×(-2)+10; (2)(-30)×(
(3)-14-(2.5-2)×
|
(1)原式=2×9+8+10
=18+8+10
=36;
(2)原式=-30×
+30×1 3
+30×5 6 3 10
=-10+25+9
=24;
(3)原式=-1-
×1 2
[4+1)]1 4
=-1-
×1 2
×51 4
=-1-5 8
=-
.13 8