1.（x-2/x+2+6x/x²-4）×（x²-4）2.(1+x²-1/x²-2x+1)÷1/x-13.x²/x²-y²÷1/x+y+y²/y-x4.（1/x+1-1/1-x²)÷3x/x+1

1.x²-2x-3 2.x²-5x-6 3.x²-9x-10 4.x²-9x-10 5.x²-2x-8 6.x²+2x-8 7.x²-x-12 8.x²+x-12 9.x²+6x-16 10.x²-14x-32 11.x²+7x-18 x²-9/x²+2x-3乘3x²-x-2/x²-5x+6, (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.（x-2/x+2+6x/x²-4）×（x²-4）2.(1+x²-1/x²-2x+1)÷1/x-13.x²/x²-y²÷1/x+y+y²/y-x4.（1/x+1-1/1-x²)÷3x/x+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 x²+2x+2 / x+1=x²+4x+6 / x+2 -1 1.x²-根号3-四分之一=02.3x²-6x-23.x(x-4)=2-8x 因式分解（有理数范围内）1.x⁴-12.x²+4x-xy-2y+43.4x²-12x+54.21x²-31x-225.4x²+4xy+y²-4x-2y-36.9x^5-35x³-4x7.3x²-6x8.49x²-259.6x²-13x+510.x²+2-3x11.12x²-23x-2412.(x+6)(x-6)-(x-6)13. 分解法因式计算：1.x五次方-8x²-x³+8 2.x四次方-4x²y²+4y四次方-3x²+6y²-4.(x-1)(x-2)(x+3)(x+6)-5x²5.(x-3)²9(x-1)1.x五次方-8x²-x³+8 2.x四次方-4x²y²+4y四次方-3x²+6y& 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)[ 已知2x²+2x-3=0 求代数式x(x²-x-1)+2(x²+1)-1/3x(3x²+6x) 计算：x²-6x+9/x²-x-6÷x²-9/x²-3x-10 乘以x+3/2x-10 1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²] 因式分解：（x²－2x）²－3x²＋6x （x²-3x）²-2x²+6x-8 (x²-2x)²-3x²+6x因式分解 待定系数法习题1.x^+6x-7 2.x^-3x+2 3.3x^+1-4x 4.-3-4x+4x^ 5.x^-1/3+1/6xx²-2x-32x²+12x+10x²-4x+3x²/4 +x-39x²-6x-8