X²-6X-9991

X²-6X-9991 (x²-7x+6)(x²-x-6)+56 分解因式：4b²c²-(b²+c²-a²)² 25（x+y)²-16(x-y)² x²-6x+9 分式加减法：化简：x²+9x/x²+3x+x²-9/x²+6x+9 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 (x²+5x+6)(x²+7x+6)－3x² 已知(x²+y²)(x²+y²-6)+9=0 ,求x²+y²的值. 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-y²+6x+9分之x²+y²-9-2xy -9x²-y²+6xy x²-1分之x²+x,化简x²-6x+9分之x²-9化简...T 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) 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 6xy²-9x²y-y²因式分解 因式分解：（x²－2x）²－3x²＋6x （x²-3x）²-2x²+6x-8