化简分式:5x/x2+x−6+2x−5x2−x−12−7x−10x2−6x+8
问题描述:
化简分式:
+5x
x2+x−6
−2x−5
x2−x−12
7x−10
x2−6x+8
答
原式=
+5x (x+3)(x−2)
-2x−5 (x+3)(x−4)
7x−10 (x−2)(x−4)
=
5x(x−4)+(2x−5)(x−2)−(7x−10)(x+3) (x+3)(x−2)(x−4)
=
.−40x+40 (x+3)(x−2)(x−4)