北师大初二下册数学基础训练分解因式(要过程，快

显示全部楼层 · 2013-3-21 00:40:44

x3-a2x=x(x2-a2)=x(x+a)(x-a)18x2+12x+2=2(9x2+6x+1)=2(3x+1)2(x2+4)-16x2=4-15x2=(2+√15x)(2-√15x)x^4-8y2(x2-2y2)=x^4-8x2y2+16y^4=(x2-4y2)2=[(x+2y)(x-2y)]2=(x+2y)2(x-2y)2...

千问 · 2013-3-21 00:40:44

x3-a2x=x(x+a)(x-a)18x2+12x+2=2(3x+1)^2（x2+4）-16x2=x^2+4-16X^2=4-15x^2=(2+√15x)(2-√15x)x4-8y2(x2-2y2)=x^4-8x^2y^2+16y^4=(x+2y)^2*(x-2y)^2...

千问 · 2013-3-21 00:40:44

x3-a2x=x(x2-a2)=x(x+a)(x-a)18x2+12x+2=2(9x2+6x+1)=2(3x+1)2（x2+4）-16x2=x2(x4-16)=x2(x2+4)(x2-4)=x2(x2+4)(x+2)(x-2)x4-8y2(x2-2y2)=x4-8x2y2+16y4=(x2-4y2)2=(x+2y)2(x-2y)2...