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∵|m+1|≥0,(n-2)^2≥0 ∴m+1=0,n-2=0 ∴m=1,n=2 ∴(1-3-4)x^2-(4+4)x-1=0 -6x^2-8x-1=0 ∴x1=(-4-√10)/3,x2=(-4+√10)/3
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