计算:(1)56a2b?23ac3+34abc(2)a?b+2b2a+b(3)2x2?4?12x?4(4)12a+3+33?2a
计算:(1)56a2b?23ac3+34abc(2)a?b+2b2a+b(3)2x2?4?12x?4(4)12a+3+33?2a....
计算:(1)56a2b?23ac3+34abc(2)a?b+2b2a+b(3)2x2?4?12x?4(4)12a+3+33?2a.
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(1)原式=
?
+
=
;
(2)原式=
=
;
(3)
?
=
-
=
=-
;
(4)原式=
-
=-
.
10c3 |
12a2bc3 |
8ab |
12a2bc3 |
9ac2 |
12a2bc3 |
=
10c3?8ab+9ac2 |
12a2bc3 |
(2)原式=
a2?b2+2b2 |
a+b |
a2+b2 |
a+b |
(3)
2 |
x2?4 |
1 |
2x?4 |
=
2 |
(x+2)(x?2) |
1 |
2(x?2) |
=
4?x?2 |
(x+2)(x?2) |
=-
1 |
x+2 |
(4)原式=
2a?3 |
(2a+3)(2a?3) |
3(2a+3) |
(2a+3)(2a?3) |
=-
4a+12 |
(2a+3)(2a?3) |
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