x/(x+3) - (x+1)/(x-2) = (x-2m)/(x²+x-6)两边同乘以x²+x-6x(x-2) - (x+1)(x+3) = x-2mx²-2x-(x²+4x+3) = x-2m-2x-4x-3 = x-2m2m = 7x+3m=7/2x+3/2x≥1，且x≠2∴m=7/2x+3/2≥7/2+3/2=5，且m≠7/2*2+3/2=17/2∴m≥5且m≠17/2
