题目内容
计算:
+
,结果等于( )
(11+4
|
(11-4
|
| A.56 | B.38
| C.24
| D.32
|
∵(11+4
)>0,(11-4
)>0,
∴原式=(11+4
)
+(11-4
)
,
=(11+4
)
+(11-4
)
,
∵2+
>0,2-
<0,
∴原式=(11+4
)(2+
)+(11-4
)(
-2),
=22+11
+8
+28+11
-22-28+8
,
=38
.
故选B.
| 7 |
| 7 |
∴原式=(11+4
| 7 |
11+ 4
|
| 7 |
4-4
|
=(11+4
| 7 |
(2+
|
| 7 |
(2-
|
∵2+
| 7 |
| 7 |
∴原式=(11+4
| 7 |
| 7 |
| 7 |
| 7 |
=22+11
| 7 |
| 7 |
| 7 |
| 7 |
=38
| 7 |
故选B.
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相关题目
计算:
+
,结果等于( )
(11+4
|
(11-4
|
| A、56 | ||
B、38
| ||
C、24
| ||
D、32
|