问题
解答题
计算: (1)
(2)
(3)
|
答案
(1)原式=
•x-2 x+3 (x+3)(x-3) (x+2)(x-2)
=
;x-3 x+2
(2)原式=
-3 x-4 24 (x+4)(x-4)
=3(x+4)-24 (x+4)(x-4)
=3x-12 (x+4)(x-4)
=
;3 x+4
(3)原式=
-1 2x
•1 x+y (x+y)(1-2x) 2x
=
-1 2x 1-2x 2x
=1-1+2x 2x
=1.