问题
填空题
已知
|
答案
=a-2ab-b 2a-2b+7ab
=
-a ab
- 2ab ab b ab
-2a ab
+2b ab 7ab ab
,
-1 b
-21 a 2(
-1 b
) +71 a
∵
-1 a
=4,1 b
∴原式=
=-4-2 2×(-4)+7
=6.-6 -1
故答案为6.
已知
|
=a-2ab-b 2a-2b+7ab
=
-a ab
- 2ab ab b ab
-2a ab
+2b ab 7ab ab
,
-1 b
-21 a 2(
-1 b
) +71 a
∵
-1 a
=4,1 b
∴原式=
=-4-2 2×(-4)+7
=6.-6 -1
故答案为6.