...4÷x平方+2x+1分之x平方-3x-4+x-1分之1,其中x=2倍根号3+1
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原式=(x-4)/(x+1)(x-1)*(x+1)²/(x-4)(x+1)+1/(x-1)
=(x-4)/(x+1)(x-1)*(x+1)/(x-4)+1/(x-1)
=1/(x-1)+1/(x-1)
=2/(x-1)
=2/(2√3+1-1)
=√3/3
