还有:
x=√2 +1 则﹙x²-2x+1)÷(x³-3x²+3x-1)=?
还有:
x=√2 +1 则﹙x²-2x+1)÷(x³-3x²+3x-1)=?
x=√2 +1 则﹙x²-2x+1)÷(x³-3x²+3x-1)
=(x-1)^2/(x-1)^3=1/(x-1)
=1/根号2
=根号2/2
(-x)²√-1÷x
=x^2*根号(-1/x)
x=-1/x>=0
x<0
(-x)²√-1÷x
=x^2*根号(-1/x)
=-x*根号(-x)^2*(-1/x)
= -x*根号(-x)