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> 当a=32,b=-12时,求(a-b+4aba-b)•(a+b-4aba+b)的值.-数学
当a=32,b=-12时,求(a-b+4aba-b)•(a+b-4aba+b)的值.-数学
题目简介
当a=32,b=-12时,求(a-b+4aba-b)•(a+b-4aba+b)的值.-数学
题目详情
当
a=
3
2
,b=-
1
2
时,求
(a-b+
4ab
a-b
)•(a+b-
4ab
a+b
)
的值.
题型:解答题
难度:中档
来源:不详
答案
原式=
(a-b
)
2
+4ab
a-b
×
(a+b
)
2
-4ab
(a+b)
=
(a+b
)
2
(a-b
)
2
(a-b)(a+b)
=a2-b2=(a+b)(a-b);
把a,b的值代入可知原式=2.
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题目简介
当a=32,b=-12时,求(a-b+4aba-b)•(a+b-4aba+b)的值.-数学
题目详情
答案
=
=a2-b2=(a+b)(a-b);
把a,b的值代入可知原式=2.