题目内容
(
x
+6x
)-(x2
-y
)
2 |
3 |
9x |
|
|
|
(
x
+6x
)-(x2
-y
)
=
x×3
+6x×
-(x
-
),
=2x
-x
+6
+
,
=x
+7
.
2 |
3 |
9x |
|
|
|
=
2 |
3 |
x |
| ||
x |
x |
xy |
=2x
x |
x |
xy |
xy |
=x
x |
xy |
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题目内容
2 |
3 |
9x |
|
|
|
2 |
3 |
9x |
|
|
|
2 |
3 |
x |
| ||
x |
x |
xy |
x |
x |
xy |
xy |
x |
xy |