Question

y=x平方+3分之2x平方-4的值域是

Answer 1

y=2x^2/(x^2+3)+4

=[2(x^2+3)-6]/(x^2+3)+4

=2-6/(x^2+3）+4

=6-6/(x^2+3)

x^2+3>=3

所以6/(x^2+3)