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We study existence and multiplicity of positive solutions for the following Dirichlet equations: &#x2212;&#x0394;u&#x2212;(&#x03BC;/|x|2)u=&#x03BB;f(x)|u|q&#x2212;2u+g(x)|u|2&#x2217;&#x2212;2u in &#x03A9;, u=0 on &#x2202;&#x03A9;, where 0&#x2208;&#x03A9;&#x2282;&#x211D;N(N&#x2265;3) is a bounded domain with smooth boundary &#x2202;&#x03A9;, &#x03BB;&#x003E;0, 0&#x2264;&#x03BC;&#x003C;&#x03BC;&#x00AF;=(N&#x2212;2)2/4, 2&#x2217;=2N/(N&#x2212;2), 1&#x2264;q&#x003C;2, and f, g are continuous functions on &#x03A9;&#x00AF; which are somewhere positive but which may change sign on &#x03A9;

Multiple Positive Solutions for Singular Elliptic Equations with Concave-Convex Nonlinearities and Sign-Changing Weights