题目内容
(-
+
+
-
)÷(-
)
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 12 |
(-
+
+
-
)÷(-
),
=(-
+
+
-
)×(-12),
=-
×(-12)+
×(-12)+
×(-12)-
×(-12),
=6-4-10+9,
=15-14,
=1.
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 12 |
=(-
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 3 |
| 4 |
=-
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 3 |
| 4 |
=6-4-10+9,
=15-14,
=1.
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定义新运算:对任意有理数a、b,都有a?b=
+
,例如,2?3=
+
=
,那么3?(-4)的值是( )
| 1 |
| a |
| 1 |
| b |
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
A、-
| ||
B、-
| ||
C、
| ||
D、
|