初二数学
因式分解: (1) x*x-8x+7 (2) x*x+7x-18
(1) x*x-8x+7 =(x-1)(x-7) (2) x*x+7x-18 =(x-2)(x+9)
你好! 1.(x-1)(x-7) 2.(x+9)(x-2) lucky!
答:1.(x^2+4x+8)^2+3x(x^2+4x+8)+2x^2 =[(x^2+4x+8)+x][(x^2+4x+8)+2x] =(x^2+5x+8)(x^2+...详情>>
答:x^4+4=x^4+4x^2+4-4x^2=(x^2+2x+2)(x^2-2x+2) =(x+1+i)(x+1-i)(x-1+i)(x-1-i)详情>>