Question

初一分式方程计算题！有悬赏！

Answer 1

1)
2-x
7
----
+
-----
=1
3x-1
1-3x
解：x-2
7
=1
-----
+
----
1-3x
1-3x
x-2+7
=
1
------
1-3x
x-2+7
=
1-3x
x+3x
=
1+2-7
4x
=
-4
x
=
-1
2)
1
1
32
----
+
---
=
---
x+2
x
x(x+2)
解：1*x
1*(x+2)
=
32
----
+
------
----
x(x+2)
x(x+2)
x(x+2)
x
+
x
+
2
=
32
2x
=
30
x
=
15
3)
4
x+1
----
-
-----
=-1
x²-1
x-1
解：
4
(x+1)(x+1)
-1(x+1)(x-1)
----------
-
------------
=
-----------
(x+1)(x-1)
(x+1)(x-1)
(x+1)(x-1)
4-(x²+1+2x)
=
1
-
x²
4-x²-1-2x
=
1-
x²
-2x
=
1-4+1
x
=
1
End
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我在做任务，拜托~)