Question

x^2+2x+1/3x^2-3/(1+1/x-1)*(1-1/x+1)求详细解法

Answer 1

=(x+1)²/3(x²-1)÷(x-1+1)/(x-1)*(x+1-1)/(x+1)

=(x+1)²/3(x+1)(x-1)*(x-1)/x*x/(x+1)

=(x+1)/3(x-1)*(x-1)/(x+1)

=1/3