问题
解答题
化简题: (1)
(2)-(-
(3)
(4)
(5)(x2-1)(
|
答案
(1)
÷(x+3)×2x-6 4-4x+x2 x2+x-6 3-x
=
×2(x-3) (x-2)2
×1 x+3 (x-2)(x+3) 3-x
=-
;2 x-2
(2)-(-
)2•(-a2 b
)3•(b2 a
)4•(2a3)1 ab
=
•a4 b2
•b6 a3
•8a31 a4b4
=8;
(3)
-2+ 3y x 2- 3y x
x+1 2 y 3
x-1 2 y 3
=
-2x+3y 2x-3y 3x+2y 3x-2y
=(2x+3y)(3x-2y)-(2x-3y)(3x+2y) (2x-3y)(3x-2y)
=
;10xy (2x-3y)(3x-2y)
(4)
÷(x+2-3-x 2x-4
)5 x-2
=
÷3-x 2(x-2) (x+2)(x-2)-5 x-2
=
×3-x 2(x-2) x-2 (x+3)(x-3)
=-
;1 2(x+3)
(5)(x2-1)(
-1 x-1
-1)1 x+1
=(x+1)(x-1)(
-1 x-1
-1)1 x+1
=x+1-(x-1)-(x+1)(x-1)
=3-x2.