请指出下面计算错在哪一步( )
1+(
)-(+
)-(-
)-(+1
)
=1
-
+
-1
①
=(1
+
)-(
-1
)②
=2-(-
)③
=2+
=2
④
1+(
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 3 |
=1
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 3 |
=(1
| 4 |
| 5 |
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 3 |
=2-(-
| 2 |
| 3 |
=2+
| 2 |
| 3 |
| 2 |
| 3 |
| A、① | B、② | C、③ | D、④ |
下列各对数中,互为倒数的是( )
A、-
| ||||
B、
| ||||
C、
| ||||
D、1
|