问题 解答题
x
x-3
-
x+6
x2-3x
+
1
x
答案

x
x-3
-
x+6
x2-3x
+
1
x

=

x2-x-6+x-3
x(x-3)

=

(x-3)(x+3)
x(x-3)

=

x+3
x

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