函数,y=(x的2次方-3)除以(2-4乘x的2次方)的值域.
问题描述：
函数,y=(x的2次方-3)除以(2-4乘x的2次方)的值域.
答
y=(x²-0.5-2.5)/(2-4x²)=(x²-0.5)/(2-4x²)-2.5/(2-4x²)=(x²-0.5)/[-4(x²-0.5)]-2.5/(2-4x²)=-1/4-5/(4-8x²)4-8x²≤4所以5/(4-8x²)0,-5/(4-8x²)≤-5/4-...