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