题目内容
计算:
①(6
-2x
)÷3
②
•(-
)÷3
③(3
-2
)2-(3
+2
)2
④
÷(
+
)
①(6
|
|
| x |
②
| 2 |
| b |
| ab5 |
| 3 |
| 2 |
| a3b |
|
③(3
| 2 |
| 3 |
| 2 |
| 3 |
④
| 3 |
| 1 | ||
|
| 1 | ||
|
①(6
-2x
)÷3
=(3
-2
)÷3
=
;
②
•(-
)÷3
=-2b
×
×
=-a2b
;
③(3
-2
)2-(3
+2
)2=(3
-2
+3
+2
)(3
-2
-3
-2
)=6
•(-4
)=-24
;
④
÷(
+
)=
÷
=
×
=
=3
-6.
|
|
| x |
| x |
| x |
| x |
| 1 |
| 3 |
②
| 2 |
| b |
| ab5 |
| 3 |
| 2 |
| a3b |
|
| ab |
3a
| ||
| 2 |
| ||
3
|
| ab |
③(3
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 6 |
④
| 3 |
| 1 | ||
|
| 1 | ||
|
| 3 |
| ||||
|
| 3 |
| ||||
|
3
| ||||||||
(
|
| 6 |
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