题目内容
(1)
-
-
(2)(2
+
)(2
-
)+(3
-5)2.
12 |
3 | ||
|
| ||
2 |
(2)(2
2 |
7 |
2 |
7 |
2 |
(1)原式=2
-
-
=
-
;
(2)原式=(2
)2-(
)2+(3
)2-30
+25
=8-7+18-30
+25
=44-30
.
3 |
3 |
2 |
=
3 |
2 |
(2)原式=(2
2 |
7 |
2 |
2 |
=8-7+18-30
2 |
=44-30
2 |
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