(x²+4x+4/x²-6x+9
-2+
9-6x+x²/4+4x+x²)*x²-x-6/4x²-4x+1应该是[(x²+4x+4)/(x²-6x+9)
-2
+
(9-6x+x²)/(4+4x+x²)]*(x²-x-6)/(4x²-4x+1)=
[(x+2)²/(x-3)²
-2
+
(x-3)²/(x+2)²]*[(x+2)(x-3)]/(2x-1)²=
[(x+2)^4
-2(x-3)²(x+2)²
+
(x-3)^4]/(x-3)²(x+2)²*[(x+2)(x-3)]/(2x-1)²=
[(x+2)²
-
(x-3)²]²/[(x-3)(x+2)]/(2x-1)²=
[5(2x-1)]²
/[(x-3)(x+2)]/(2x-1)²=
25/[(x-3)(x+2)]
【也可以写作:25/(x²-x-6)】如果是[(x²+4x+4)/(x²-6x+9)
-2
+
(9-6x+x²)/(4+4x+x²)]*(x²-x-6)²/(4x²-4x+1)最后结果是25【过程参考前面过程】