若1- 2/x + 1/x² =0,那么1/x³的值是（ ）A.-1/8 B.1/8 C.-1 D.1

计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y²÷x+2y/x²+xy (x²-4分之x²+x+1)²÷(x三次方-3x²+2x÷x三次方)²×(x÷x+2)² , (x² +x+1)/(x² +1)+(2x² +x+2)/(x² +x+1) =19/6化成(x² +x+1)/(x² +1)+(x² +1)/(x² +x+1)=13/6急嗷 化简~(x²+3x+9/x²-27)+(6x/9x-x²)-(x-1/6+2x)(x²+3x+9/x²-27)+(6x/9x-x²)-(x-1/6+2x)注意了!是三个分式!(x²+3x+9)/(x²-27)+(6x)/(9x-x²)-(x-1)/(6+2x) 1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²] 一道高一衔接数学思考题,代数,2(X²+6X+1)²+5(X²+1)(X²+6X+1)+2(X²+1)² 2(x²+6x+1)²+5(x²+1)(x²+6x+1)+2(x²+1）²因式分解 若不等式x-a/x²+x+1>x-b/x²-x+1的解集为1/2 2a(x²+1)²-2ax²因式分解 因式分解：(2x²-3x+1)²-22x²+33x-1 分解因式(2X²-3X+1)²-22X²+33X-1 xy²/(x²y-y) × x²/(x²+x)=(x²-3x)/(x²-5x) × 2x-10/(x²-6x+9)=化简求植x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1 两个初升高衔接教材的数学题.①(x²+x+1)(x²+x+2)-12=(x²+x+1)(x²+x+1+1)-12=(x²+x+1)²+(x²+x+1)-12=(x²+x-3)(x²+x+5)[十字相乘法]②(x²+x)²-8(x²+x)+12=(x²+x-2)(x²+x-6)[ 3x/(x²-2x),(2x+1)/(4-x²),3/(2x²+4x)通分~ x²+2x+2 / x+1=x²+4x+6 / x+2 -1 若(x-2)º无意义,求(2x+1)²-(2x-1)²的值 一道数学题快回答急(x³)²÷x²×x+x÷（-x）²（-x²) 小的×就是乘 3b-2a²-(-4a+a²+3b)+a² (-a)²×(a²)²÷a³ (-x)³×x²n-1+x²n×（x）²（注意那个x²后 ①.X²-2X+1/X²-1 ÷ X²-X/X+1②.a-1/a²-4a+4 ÷ a²-1/a²-4③.x³-x²/x²-x ÷ x²-2x/x-1④.(x-y)²/x+y ÷ 1/y+x X 1/x-y帮下忙嘛 咯