题目内容
计算:(写出主要运算过程)
(1)(+4.3)-(-4)+(-2.3)-(+4).
(2)(-1)101×(-4
)÷|-9|
(3)-22-(-1)5×
(4)
-
(结果精确到0.1)
(1)(+4.3)-(-4)+(-2.3)-(+4).
(2)(-1)101×(-4
| 1 |
| 2 |
(3)-22-(-1)5×
| 81 |
(4)
| 15 |
| 3 | 6 |
(1)(+4.3)-(-4)+(-2.3)-(+4).
=4.3+4-2.3-4
=(4.3-2.3)+(4-4)
=2;
(2)(-1)101×(-4
)÷???|-9|
=-1×(-
)×
=
;
(3)-22-(-1)5×
=-4-(-1)×9
=-4+9
=5;
(4)
-
(结果精确到0.1)
=2.055862753
≈2.1.
=4.3+4-2.3-4
=(4.3-2.3)+(4-4)
=2;
(2)(-1)101×(-4
| 1 |
| 2 |
=-1×(-
| 9 |
| 2 |
| 1 |
| 9 |
=
| 1 |
| 2 |
(3)-22-(-1)5×
| 81 |
=-4-(-1)×9
=-4+9
=5;
(4)
| 15 |
| 3 | 6 |
=2.055862753
≈2.1.
练习册系列答案
相关题目