(1)−32x−4÷1/x−2•x2−4x2+3x−2 (2)1−x2x2−x−6• 9−6x+x22x2+6x+4÷x2−4x+35x2+20x+20.
问题描述:
(1)
÷−3 2x−4
•1 x−2
x2−4
x2+3x−2
(2)
• 1−x2
x2−x−6
÷9−6x+x2
2x2+6x+4
.
x2−4x+3 5x2+20x+20
答
(1)原式=
×−3 2(x−2)
×x−2 1
(x+2)(x−2)
x2+3x−2
=-
;3x2−12 2x2+6x−4
(2)原式=
×−(x+1)(x−1) (x−3)(x+2)
×(x−3)2 2(x+1)(x+2)
5(x+2)2
(x−3)(x−1)
=-
.5 2