问题
解答题
把根号外的因式移到根号内: (1)-5
(2)(1-x)
|
答案
(1)原式=-5×5 25
=-5×5 5
=-
;5
(2)原式=(1-x)•x-1 (x-1)2
=(1-x)•x-1 x-1
=-
.x-1
把根号外的因式移到根号内: (1)-5
(2)(1-x)
|
(1)原式=-5×5 25
=-5×5 5
=-
;5
(2)原式=(1-x)•x-1 (x-1)2
=(1-x)•x-1 x-1
=-
.x-1