题目内容
(-1
+1
÷1
) ÷(1-3
×1
+
)=( )
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 5 |
-4
| ||
2
|
A、
| ||
B、-
| ||
C、
| ||
D、-
|
分析:此题根据有理数的混合运算顺序,先算括号里面的乘法和除法,再算加减,即可求出最后答案;
解答:解:(-1
+1
÷1
) ÷(1-3
×1
+
)
=(-1
+
×
) ÷(1-
×
-2)
=(-
+
) ÷(1-4-2)
=(-
+
) ×(-
)
=
,
故选C.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 5 |
-4
| ||
2
|
=(-1
| 1 |
| 2 |
| 4 |
| 3 |
| 6 |
| 7 |
| 10 |
| 3 |
| 6 |
| 5 |
=(-
| 3 |
| 2 |
| 8 |
| 7 |
=(-
| 3 |
| 2 |
| 8 |
| 7 |
| 1 |
| 5 |
=
| 1 |
| 14 |
故选C.
点评:此题考查了有理数的混合运算;在解题时要把除法变成乘法分别进行计算是解题的关键,要注意结果的符号.
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