题目内容
若x-y=
,则4x-4y=______,-x+y+
=______.
| 3 |
| 4 |
| 7 |
| 4 |
∵x-y=
,
代入4x-4y,得4x-4y=4(x-y)=4×
=3;
代入-x+y+
,得,-x+y+
=-(x-y)+
=-
+
=1.
| 3 |
| 4 |
代入4x-4y,得4x-4y=4(x-y)=4×
| 3 |
| 4 |
代入-x+y+
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 3 |
| 4 |
| 7 |
| 4 |
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