题目内容
计算:(+0.25)-(-3
)-(+5
)-(+
)
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
分析:因为+0.25与+
相等,所以把+
化为小数+0.25,因此+0.25-0.25=0;再计算-(-3
)-(+5
),变为-(5
-3
),
通分计算即可.
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 8 |
通分计算即可.
解答:解:(+0.25)-(-3
)-(+5
)-(+
),
=0.25+3
-5
-0.25,
=(0.25-0.25)-(5
-3
),
=-(5
-3
),
=-2
.
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=0.25+3
| 1 |
| 8 |
| 3 |
| 4 |
=(0.25-0.25)-(5
| 3 |
| 4 |
| 1 |
| 8 |
=-(5
| 6 |
| 8 |
| 1 |
| 8 |
=-2
| 5 |
| 8 |
点评:做此类题目,重点注意运算符号的变化情况.
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