1/x2−3x+2+1/x2−5x+6+1/x2−4x+3.
问题描述:
+1
x2−3x+2
+1
x2−5x+6
. 1
x2−4x+3
答
原式=
+1 (x−2)(x−1)
+1 (x−2)(x−3)
1 (x−1)(x−3)
=
x−3+x−1+x−2 (x−1)(x−2)(x−3)
=
x−3+x−1+x−2 (x−1)(x−2)(x−3)
=
3(x−2) (x−1)(x−2)(x−3)
=
.3 (x−1)(x−3)