问题
解答题
计算: (1)3
(2)(
(3)
(4)
|
答案
(1)原式=3
-42
-3
+122
=23
+82
;3
(2)原式=3-2
+1-2+2(3
-1)+1=3-23
+1-2+23
-2+1=1;3
(3)原式=
•2•a b 3 2
=a2b•
•b2 a 1 a3b 3a b
=b2 a2
•3a b
=3;b a
(4)原式=a
+b
-ab
-bab
=aa
-bb
.a