(7-2x+x^2)-(5+3x-2x^2)=

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(7-2x+x^2)-(5+3x-2x^2)=
-(x^3+2x^2-1)+(x^3-2x^2+x-2)=
(2ax-3by-5)-2(ax-2)+(-2by+1)=

(7-2x+x^2)-(5+3x-2x^2)
=7-2x+x^2-5-3x+2x^2
=2-5x+3x^2
-(x^3+2x^2-1)+(x^3-2x^2+x-2)
=-x^3-2x^2+1+x^3-2x^2+x-2
=-4x^2+x-1
(2ax-3by-5)-2(ax-2)+(-2by+1)
=2ax-3by-5-2ax+4-2by+1
=-5by
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x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 2x+3x+4x+5x+x+6x+7x=100 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| (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 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), (3-x)/(1-x)-(5-x)/(7-x)+(x^2-x)/(x^2-8x+7)=1 解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7) 解方程：x+2/x+1-x+3/x+2=x+6/x+5-x+7/x+6 x-1\x-2+x-6\x-7=x-2\x-3+x-5\x-6 分式方程