题目内容
计算:
(1)-165+265-78-22+65;
(2)(-
)-(-2
)+2
+(-
)-3
;
(3)-42-12×(
-1)÷(-1
);
(4)3-(-2)×(-1)-8÷(-
)2×|-3+1|.
(1)-165+265-78-22+65;
(2)(-
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
| 7 |
| 8 |
| 2 |
| 3 |
(3)-42-12×(
| 1 |
| 3 |
| 1 |
| 3 |
(4)3-(-2)×(-1)-8÷(-
| 1 |
| 2 |
(1)原式=-100+265-100
=-200+265
=65;
(2)原式=-
+2
+2
-
-3
=-
-1
+2
-
=1-
-
=
;
(3)原式=-16-12×(-
)÷(-1
)
=-16+8÷(-1
)
=-16-6
=-22;
(4)原式=3-2-8÷
×2
=1-64
=-63.
=-200+265
=65;
(2)原式=-
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
| 7 |
| 8 |
| 2 |
| 3 |
=-
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
| 7 |
| 8 |
=1-
| 20 |
| 24 |
| 3 |
| 24 |
=
| 1 |
| 24 |
(3)原式=-16-12×(-
| 2 |
| 3 |
| 1 |
| 3 |
=-16+8÷(-1
| 1 |
| 3 |
=-16-6
=-22;
(4)原式=3-2-8÷
| 1 |
| 4 |
=1-64
=-63.
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