数学九年级上册34页练习题1.2(降次---解一元二次方程)两题都要详细过程哦!
1.填空:
(1) x^2+10x+___ = ( x+___ )^2; (2) x^2-12x+___ = ( x -___ )^2;
(3) x^2+5x+___ = ( x+___ )^2; (4) x^2-(2/3)x+___ = ( x-___ )^2.
2.解下列方程：
(1) x^2+10x+9=0 ; (2) x^2-x-（7/4)=0 ;
(3) 3x^2+6x-4=0 ; (4) 4x^2-6x-3=0 ;
(5) x^2+4x-9=2x-11 ; (6) x(x+4)=8x+12 .