求下列函数的定义域 y=log3(x^2-x-12) 2.y=log1/2(x^2-4x)+根号x+3y=log3(x^2-x-12)y=log1/2(x^2-4x)+根号x+3y=ln(x^2-1)+1/根号x-3

求下列函数的定义域 y=log3(x^2-x-12) 2.y=log1/2(x^2-4x)+根号x+3y=log3(x^2-x-12)y=log1/2(x^2-4x)+根号x+3y=ln(x^2-1)+1/根号x-3
求下列函数的定义域 y=log3(x^2-x-12) 2.y=log1/2(x^2-4x)+根号x+3
y=log3(x^2-x-12)
y=log1/2(x^2-4x)+根号x+3
y=ln(x^2-1)+1/根号x-3

求下列函数的定义域 y=log3(x^2-x-12) 2.y=log1/2(x^2-4x)+根号x+3y=log3(x^2-x-12)y=log1/2(x^2-4x)+根号x+3y=ln(x^2-1)+1/根号x-3
真数大于零就好,根号下非负,分母不为零