练习1、填空: (1)x2+8x+16=(x+4 25 (2)x2-5x+4=(x-2) 4 (3) x-+-x+9=(x+3 (4) 2 X 4334 x+64=(x 38 3)x2+px+4=(x+2)
8 __ ( _) . 2 2 x + x + = x + 5 __ ( _) . 2 2 x − x + = x − __ ( __) . 3 2 4 2 x + x + = x + __ ( __) . 4 2 3 2 x − x + = x − __ ( __) . 2 2 x + px + = x + 16 4 4 25 2 5 3 2 9 4 8 3 64 9 2 p 4 2 p 练习 1、填空: (1) (2) (3) (4) (5)
例:用配方法解下列方程: (1)x2+6x-1=0 (2)x2=6-5x (3)-x2+4x-3=0
例:用配方法解下列方程: (2) x2=6-5x (3) -x 2+4x-3=0 (1) x2+6x-1=0