问题
解答题
化简: (1)(
(2)(m-3n)-2•(2m-2n-3)-2 (3)a-2b2•(-2a2b-2)-2÷(a-4b2) (4)(2m2n-3)3(-mn-2)-2. |
答案
(1)(
-3
)0-(-2
)-21 2
=1-4
=-3;
(2)(m-3n)-2•(2m-2n-3)-2
=m6n-2•2-2m4n6
=
m6+4n-2+61 4
=
m10n4;1 4
(3)a-2b2•(-2a2b-2)-2÷(a-4b2)
=a-2b2•(-2)-2a-4b4÷(a-4b2)
=
a-2-4-(-4)b2+4-21 4
=
a-2b41 4
=
;b4 4a2
(4)(2m2n-3)3(-mn-2)-2
=23m6n-9(-m)-2n4
=8m6-2n-9+4
=8m4n-5
=
.8m4 n5