计算:a2a+b-a-b=______,(1x2-1a2)÷(1x+1a)=______.-数学

题目简介

计算:a2a+b-a-b=______,(1x2-1a2)÷(1x+1a)=______.-数学

题目详情

计算:
a2
a+b
-a-b=______,(
1
x2
-
1
a2
)÷(
1
x
+
1
a
)
=______.
题型:填空题难度:中档来源:不详

答案

a2
a+b
-a-b
=
a2-(a+b)2
a+b

=-
2ab+b2
a+b


(class="stub"1
x2
-class="stub"1
a2
)÷(class="stub"1
x
+class="stub"1
a
)

=
(class="stub"1
x
+class="stub"1
a
)(class="stub"1
x
-class="stub"1
a
)
class="stub"1
x
+class="stub"1
a

=class="stub"1
x
-class="stub"1
a

=class="stub"a-x
ax

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