要答案
(1)(a-2b+1)^2
(2)(x+2y-5)(x-2y+5)
(3)(3x-2y+z)(-2y-z+3x)
(4)(a+b-c)^2
(5)(x-3y+1)(x-3y-1)
(6)(-y+2x-3)^2
(7)(x-y+1)(x-1-y)
(8)(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2 其中x=-1/2,y=2 要过程
(9)(a-b)(a+b)(a^2+b^2)
要答案
(1)(a-2b+1)^2
(2)(x+2y-5)(x-2y+5)
(3)(3x-2y+z)(-2y-z+3x)
(4)(a+b-c)^2
(5)(x-3y+1)(x-3y-1)
(6)(-y+2x-3)^2
(7)(x-y+1)(x-1-y)
(8)(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2 其中x=-1/2,y=2 要过程
(9)(a-b)(a+b)(a^2+b^2)
全都要过程么?