计算:(1)ba?b+1a (2)(a?2b)2ab?(a+2b)2ab (3)x2?y(x?3)2?9?y(3?x)2 (4)a2?1a2?2a+4a?52a?a2
计算:(1)ba?b+1a(2)(a?2b)2ab?(a+2b)2ab(3)x2?y(x?3)2?9?y(3?x)2(4)a2?1a2?2a+4a?52a?a2....
计算:(1)ba?b+1a (2)(a?2b)2ab?(a+2b)2ab (3)x2?y(x?3)2?9?y(3?x)2 (4)a2?1a2?2a+4a?52a?a2.
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(1)
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=
=?
;
(2)
?
=
=
=-8;
(3)
?
=
?
=
=
=
;
(4)
+
=
?
=
=
=
b |
a |
b+1 |
a |
b?b?1 |
a |
1 |
a |
(2)
(a?2b)2 |
ab |
(a+2b)2 |
ab |
(a?2b)2?(a+2b)2 |
ab |
a2?4ab+4b2?a2?4ab?4b2 |
ab |
(3)
x2?y |
(x?3)2 |
9?y |
(3?x)2 |
x2?y |
(x?3)2 |
9?y |
(x?3)2 |
x2?y?9+y |
(x?3)2 |
(x+3)(x?3) |
(x?3)2 |
x+3 |
x?3 |
(4)
a2?1 |
a2?2a |
4a?5 |
2a?a2 |
a2?1 |
a(a?2) |
4a?5 |
a(a?2) |
a2?4a+4 |
a(a?2) |
(a?2)2 |
a(a?2) |
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