问题
解答题
(1)(-19)-(+42)-(-5)+(-9) (2)(-5)×(-7)-5×(-6) (3)(
(4)(-3)2-23÷
|
答案
(1)原式=-19-42+5-9
=-70+5
=-65;
(2)原式=25+30
=65;
(3)原式=-12×
-12×5 12
+12×2 3 3 4
=-5-8+9
=-4;
(4)原式=9-8×3×3
=9-72
=-63.
(1)(-19)-(+42)-(-5)+(-9) (2)(-5)×(-7)-5×(-6) (3)(
(4)(-3)2-23÷
|
(1)原式=-19-42+5-9
=-70+5
=-65;
(2)原式=25+30
=65;
(3)原式=-12×
-12×5 12
+12×2 3 3 4
=-5-8+9
=-4;
(4)原式=9-8×3×3
=9-72
=-63.