若x²-3x+5=7则-2x²+6x+3=

x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 若x²-3x+5=7则-2x²+6x+3= 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 2x+3x+4x+5x+x+6x+7x=100 已知(x-2)(x²-6x-9)=x(x-5)(x-3),求6x的算术平方根 若x²+3x-1/3=0 则代数式x-3/3x²-6x÷(x+2-5/x-2)的值 4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½ 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 若3x²-x=1,则6x^3+7x²-5x+2000=? 设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),