1/(x^2+3x+2)+1/(x^2+5x+6)+1/(x^2+7x+12)+1/(x^2+9x+20) 化简,不是解
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1/(x^2+3x+2)+1/(x^2+5x+6)+1/(x^2+7x+12)+1/(x^2+9x+20) 化简,不是解方程.急.
1/(x^2+3x+2)+1/(x^2+5x+6)+1/(x^2+7x+12)+1/(x^2+9x+20)
=1/﹙x+1﹚﹙x+2﹚+1/﹙x+2﹚﹙x+3﹚+1/﹙x+3﹚﹙x+4﹚+1/﹙x+4﹚﹙x+5﹚
=1/﹙x+1﹚-1/﹙x+2﹚+1/﹙x+2﹚-1/﹙x+3﹚+1/﹙x+3﹚-1/﹙x+4﹚+1/﹙x+4﹚-1/﹙x+5﹚
=1/﹙x+1﹚-1/﹙x+5﹚
=4/﹙x²+6x+5﹚
=1/﹙x+1﹚﹙x+2﹚+1/﹙x+2﹚﹙x+3﹚+1/﹙x+3﹚﹙x+4﹚+1/﹙x+4﹚﹙x+5﹚
=1/﹙x+1﹚-1/﹙x+2﹚+1/﹙x+2﹚-1/﹙x+3﹚+1/﹙x+3﹚-1/﹙x+4﹚+1/﹙x+4﹚-1/﹙x+5﹚
=1/﹙x+1﹚-1/﹙x+5﹚
=4/﹙x²+6x+5﹚
1/(x^2+3x+2)+1/(x^2+5x+6)+1/(x^2+7x+12)+1/(x^2+9x+20) 化简,不是解
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
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(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x