3x^2-12x+3大于0 求x的取值范围
问题描述:
3x^2-12x+3大于0 求x的取值范围
答
3(X^2-4X+1) =3(X^2-4X+4-3) =3[(X-2)^2-3] =3[(X-2)+根3][(X-2)-根3] X=2+根3
3x^2-12x+3大于0 求x的取值范围
3(X^2-4X+1) =3(X^2-4X+4-3) =3[(X-2)^2-3] =3[(X-2)+根3][(X-2)-根3] X=2+根3