[x-1+(x+1)分之1)÷(x-1)分之x的平方
=(x+1)分之(x²-1+1) * [x²分之(x-1)]
=(x+1)分之x² * [x²分之(x-1)]
=(x+1)分之(x-1)
=(5+1)分之(5-1)
=6分之4
=3分之2