Getty / LAPD Composite

The Menendez brothers are making a last-ditch effort to get a new trial, and none of what they've presented is compelling enough to get them one ... so says the Los Angeles County District Attorney.

The D.A.'s Office filed a 132-page response to the writ of habeas corpus submitted on behalf of Erik and Lyle , in which the office ripped into their attempt to get a new trial based on two pieces of what they call "new evidence" in the case.

The D.A.'s argument is focused on the premeditated nature of the murders ... writing, "There are few murder cases in which the evidence of planning and premeditation is as stark as that presented in this case." Getty

D.A. Nathan Hochman says none of the new evidence presented -- the letter Erik purportedly wrote

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