先化简(2x-1)²-(3x+1)(3x-1)+20x³(x-1)÷(-2x)²
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
(2x²-2x+3)(-x³+x-1)
先化简代数式再求值(3/x+1 - x+1)÷x²-2x/x+1,其中x满足方程x/x-1+1/x=1
先化解,在求值;(3x/x-1-x/x+1)÷x四次方-4x²/x³-x,其中x=根号2+2
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
6x+(2x²-3x)-(x²-1)
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)
(1-x/3-x)²/(3-2x-x²/9-x²)³*(x²/x
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
1.(x²-9)/(x²+2x²+x)*(3x³+9x²)/(x
先化简在求值(x-1/3x-x+1/x)*x/x²-1,其中x=√2-3
(3x/x-1-x/x+1)×x²-1/x 其中x=根号2-2 先化简