解:∵m2=25,∴m=±5,又∵ab=1,c+d=0,∴=3(c+d)﹣2ab+m,当m=5时,3(c+d)﹣2ab+m=﹣2+=﹣,当m=﹣5时,3(c+d)﹣2ab+m=﹣2﹣=﹣.故答案为:﹣或﹣.
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