题目内容
先化简,再求值5
-
+x
,其中x=10.
|
5 |
4 |
|
|
5
-
+x
=5×
-
×
+x•
=
-
+3
=
,
将x=10代入得:原式=
×
=
.
|
5 |
4 |
|
|
=5×
| ||
5 |
5 |
4 |
2 |
5 |
5x |
3
| ||
x |
=
5x |
| ||
2 |
5x |
=
7 |
2 |
5x |
将x=10代入得:原式=
7 |
2 |
5×10 |
35 |
2 |
2 |
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