10x^2+5√3x+2√7x+√21=0

10x^2+5√3x+2√7x+√21=0 已知x*x-3x+1=0求√(x*x+1/x-2)=? 100分x^3(2x-5)(x+1)+(5x+2)(x-1)=0x^2/3+48/x^2=10(x/3-4/x)√x-1 0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7 解方程4x^2+2x√(3x^+x)+x-9=0 (2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1 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 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 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 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), 4x^2 +6x - [5 √(2x^2+3x+9) ] +15=0 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?