(x+1)(x+2)(x+3)(x+4)-(x^2+5x+3)(x^2+5x+7)=?
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(x+1)(x+2)(x+3)(x+4)-(x^2+5x+3)(x^2+5x+7)=?
=[(x+1)(x+4)][(x+2)(x+3)]-[(x^2+5x)+3][(x^2+5x)+7]
=[(x^2+5x)+4][(x^2+5x)+6]-[(x^2+5x)+3][(x^2+5x)+7]
=[(x^2+5x)^2+10(x^2+5x)+24]-[(x^2+5x)^2+10(x^2+5x)+21]
=(x^2+5x)^2+10(x^2+5x)+24-(x^2+5x)^2-10(x^2+5x)-21
=3
=[(x^2+5x)+4][(x^2+5x)+6]-[(x^2+5x)+3][(x^2+5x)+7]
=[(x^2+5x)^2+10(x^2+5x)+24]-[(x^2+5x)^2+10(x^2+5x)+21]
=(x^2+5x)^2+10(x^2+5x)+24-(x^2+5x)^2-10(x^2+5x)-21
=3
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|
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
2x+3x+4x+5x+x+6x+7x=100
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),
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
1x+2x+3x+4x+5x+6x+7x…+99x=100
(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)
解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3