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-1/3^2a^m-1b^2和4^3a^2b^n-1是同類項那麼就有a,b幂次相等 n-1=2;m-1=2 所以m=3,n=3,(m+n)/2=3 -2*3-6=0 所以3是方程的解,所以x=(m+n)/2是方程-2x-6=0的解.
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