maple 如何化简assume(a > 0,b > 0,c > 0,m > n,n > 0,x > 1/2,x < 1);factor(-c*m^2+c*m*n+2*b*n(-2*x^2*n+m(1-2*x)^2+2*x*n)+2*c*m-4*a(-2*x^2*n+m(1-2*x)^2+2*x*n));u := %;u := -c*m^2+c*m*n+2*b*n(-2*x^2*n+m(1-2*x)^2+2*x*n)+2*c*m-4*a(-2*x^2*n+m(1-2*x)^2+2
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