化简:aa-b-ba-b=______;aa-b+bb-a=______;x2x2-y2-y2x2-y2=______.

化简:aa-b-ba-b=______;aa-b+bb-a=______;x2x2-y2-y2x2-y2=______.

题型:解答题难度:一般来源:不详
化简:
a
a-b
-
b
a-b
=______;
a
a-b
+
b
b-a
=______;
x2
x2-y2
-
y2
x2-y2
=______.
答案
a
a-b
-
b
a-b
=
a-b
a-b
=1;
a
a-b
+
b
b-a
=
a
a-b
-
b
a-b
=
a-b
a-b
=1;
x2
x2-y2
-
y2
x2-y2
=
x2-y2
x2-y2
=1.
故答案为:1;1;1
举一反三
计算:
a
a2-b2
-
b
a2-b2
=______.
题型:填空题难度:简单| 查看答案
计算:
x+2
x+1
-
x+1
x+2
=______.
题型:填空题难度:一般| 查看答案
计算:
a2-1
a+2
-
1-a
a+2
=______.
题型:填空题难度:一般| 查看答案
计算:
x+2y
1-x2
+
y-1
x2-1
-
y
1-x2
题型:解答题难度:一般| 查看答案
计算:
y
y2-x2
-
1
y+x
=______.
题型:填空题难度:一般| 查看答案
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