题目内容

计算:
(1)
7a
3(a-4)
+
4a
3(4-a)

(2)
x2
x-1
-x-1

(3)
12
m2-9
+
2
3-m
+
1
m+3

(4)
x2
y-x
-
y2
y-x

(5)
a2
a+1
+1-a

(6)(
x+2
x2-2x
-
x-1
x2-4•x+4
)•
x
4-x
(1)原式=
7a-4a
3(a-4)

=
a
a-4


(2)原式=
x2
x-1
-
(x+1)(x-1)
x-1

=
x2-x2+1
x-1

=
1
x-1


(3)
12
m2-9
-
2m+6
m2-9
+
m-3
m2-9

=
3-m
m2-9

=-
1
m+3


(4)原式=
x2-y2
y-x

=
(x-y)(x+y)
y-x

=-x-y;

(5)原式=
a2
a+1
+
1-a2
a+1

=
1
a+1


(6)原式=[
x+2
x(x-2)
-
x-1
(x-2)2
]•
x
4-x

=[
x2-4
x(x-2)2
-
x2-x
x(x-2)2
]•
x
4-x

=-
1
x2-4x+4
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