题目内容
(1)
×(-6
) (x>0,y>0);
(2)(1-2
)(1+2
)-(2
+1)2.
| 1 |
| 3 |
| x2y |
|
(2)(1-2
| 3 |
| 3 |
| 3 |
(1)原式=
×(-6)
=-2
=-2y
;
(2)原式=1-(2
)2-[(2
)2+4
+1]
=1-12-12-4
-1
=-24-4
.
| 1 |
| 3 |
x2y×
|
=-2
| xy3 |
=-2y
| xy |
(2)原式=1-(2
| 3 |
| 3 |
| 3 |
=1-12-12-4
| 3 |
=-24-4
| 3 |
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