题目内容
计算:
(1)(
)-3+42+20120
(2)(
-
+
)•y6
(3)
-
.
(1)(
| 1 |
| 3 |
(2)(
| 2 |
| y3 |
| 3 |
| y2 |
| 4 |
| y |
(3)
| (1+m)2 |
| m |
| 1+2m2 |
| m |
(1)(
)-3+42+20120
=27+16+1
=44;
(2)(
-
+
)•y6
=
•y6-
•y6+
•y6
=2y3-3y4+4y5;
(3)
-
=
=
=2-m.
| 1 |
| 3 |
=27+16+1
=44;
(2)(
| 2 |
| y3 |
| 3 |
| y2 |
| 4 |
| y |
=
| 2 |
| y3 |
| 3 |
| y2 |
| 4 |
| y |
=2y3-3y4+4y5;
(3)
| (1+m)2 |
| m |
| 1+2m2 |
| m |
=
| 1+2m+m2-1-2m2 |
| m |
=
| 2m-m2 |
| m |
=2-m.
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