问题
解答题
①(
②(2ab2)-2•(a2b-2)-1. |
答案
①原式=[
-a-1 (a-2)2
]÷a+2 a(a-2) 4-a a
=[
-a(a-1) a(a-2)2
]•(a+2)(a-2) a(a-2)2 a 4-a
=
•a2-a-(a2-4) a(a-2)2 a 4-a
=
•4-a a(a-2)2 a 4-a
=
;1 (a-2)2
②原式=
a-2b-4•a-2b21 4
=
a-4 b-21 4
=1 4a4b2