x²-2x=3,则5x²-10x+1
5x²+[x²+(5x²-2x)]-2(x²-3x),其中x=-1
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
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
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
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),
3x²-[5x-(x-2)+2x²]其中x= -1/2
代数式6x+2x²-3x+x²+1,其中x=-5
解方程:x(x+2)+(2x+1)(2x-1)=5(x²+3)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550