3(x²-2x-6)-3x(x-5)=0

x²-9/x²+2x-3乘3x²-x-2/x²-5x+6, 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 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) 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)[ 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 4x²-[2x-(x²-2x+3)-2(x²-3x)] 计算 因式分解：（x²－2x）²－3x²＋6x （x²-3x）²-2x²+6x-8 (x²-2x)²-3x²+6x因式分解 混合运算6x+2x²-3x+x²+1其中x＝-5 解不等式x²（x²-x-2）＜3x³-3x²-6x 多项式 x²-3x+2,x²-18x+32,x²+x-6的公因式 3x² - 9x + 2 = 0 x² - 14x = 8 x² + 6x = 1 1/X²+3X+2 +1/X²+5X+6 +1/X²+7X+12 +1/X²+9X+20 (x²-4分之x²+x+1)²÷(x三次方-3x²+2x÷x三次方)²×(x÷x+2)² , 化简x(x-1)+2x(x+1)-3x(2x-5)我是这一算的，化简x(x-1)+2x(x+1)-3x(2x-5)=x²-x+2x²+2x-6x²+15x=x+2x²-6x²+15x=18x+2x²-6x²=12x²-6x²可以相减吗，还是我算的不对了？