Giải các PT : a,3x+2/3x-2-6/2+3x=9x^2/9x^2-4 b,3/5x-1+ 2/3-5x=4/(1-5x)(x-3) c,3/1-4x=2/4x+1-8+6x/16x^2-1 d,5-x/4x^2-8x+7/8x=x-1/2x(x-2)+1/8x-16 e,x+1/x^2+x+1-x-1/x^2-x+1=3/x(x^4+x^2+1)
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