1.m(x-y-z)+n(y+z-x)=(x-y-z)*?
问题描述:
1.m(x-y-z)+n(y+z-x)=(x-y-z)*?
2.x^2-(a+1)x+a+?
3.6x^2+7x+2=?
答
1.m(x-y-z)+n(y+z-x)=(x-y-z)*(m-n)
2.x^2-(a+1)x+a=(x-1)(x-a)
3.6x^2+7x+2=(2x+1)(3x+2)第二第三题能说下解答过程麽= =~~谢谢哈x^2-(a+1)x+a=(x^2-ax)-(x-a)=x(x-a)-(x-a)=(x-a)(x-1)6x^2+7x+2=(2x+1)*(3x+2)十字相乘:2 13 2------------------------2*2+3*1=7