2x-6/x^2-4x+4除以12-4x/x^2+5X-6除以x^2+5x+6/x^2-5x-6

显示全部楼层 · 2012-12-1 15:12:33

别忽略了分数线的作用，原来的分子分母分开写上下两行，输入电脑就要加括号啊[ (2x - 6) / (x" - 4x + 4) ] / [ (12 - 4x) / (x" + 5x - 6) ] / [ (x" + 5x + 6) / (x" - 5x - 6) ]= [(2x - 6) / (x" - 4x + 4)] X [(x" + 5x - 6) / (12 - 4x)] X [(x" - 5x - 6) / (x" + 5x + 6)]= [ (2x - 6)(x" + 5x - 6)(x" - 5x - 6) ] / [ (x" - 4x + 4)(12 - 4x)(x" + 5x + 6) ]= [ 2(x - 3)...

千问 · 2012-12-1 15:12:33

2x-6/x^2-4x+4除以12-4x/x^2+5X-6除以x^2+5x+6/x^2-5x-6=(2x-6/x^2-4x+4)* (x^2+5X-6/12-4x) *(x^2-5x-6/x^2+5x+6)=(2(x-3)/(x-2)^2)* ((x-1)(x+6)/4(3-x))*((x-6)(x+1)/(x+2)(x+3))=(-1/(x...