搜搜考试网1/X²+3X+2 +1/X²+5X+6 +1/X²+7X+12 +1/X²+9
来源：学生作业帮 编辑：搜搜考试网作业帮 分类：数学作业 时间：2024/05/03 14:34:44
1/X²+3X+2 +1/X²+5X+6 +1/X²+7X+12 +1/X²+9X+20
原式= 1/(x+1)(x+2) + 1/(x+2)(x+3) + 1/(x+3)(x+4) + 1/(x+4)(x+5)
= (x+3+x+1) / [ (x+1)(x+2)(x+3) ] + (x+5+x+3) / [ (x+3)(x+4)(x+5)]
= 2 / [(x+1)(x+3)] + 2/ [(x+3)(x+5)]
= [2(x+5)+2(x+1)] / [ (x+1)(x+3)(x+5)]
= (4x+12) / [ (x+1)(x+3)(x+5)]
= 4 / [ (x+1)(x+5)]
= (x+3+x+1) / [ (x+1)(x+2)(x+3) ] + (x+5+x+3) / [ (x+3)(x+4)(x+5)]
= 2 / [(x+1)(x+3)] + 2/ [(x+3)(x+5)]
= [2(x+5)+2(x+1)] / [ (x+1)(x+3)(x+5)]
= (4x+12) / [ (x+1)(x+3)(x+5)]
= 4 / [ (x+1)(x+5)]
1/X²+3X+2 +1/X²+5X+6 +1/X²+7X+12 +1/X²+9
2(x²-1²)
化简~(x²+3x+9/x²-27)+(6x/9x-x²)-(x-1/6+2x)
7/x²+x+3/x²-x=6/x²-1
（x²-5x+6分之x²-3x+2）²/（x²-2x-3分之x-1）²
已知3X²-X=1,求6X³+9X²-5x²+2007的值
计算:(1).(-2xy²)*(3x²y)²
分解因式(2X²-3X+1)²-22X²+33X-1
因式分解：(2x²-3x+1)²-22x²+33x-1
1-x²+2xy-y²
(x-1)(x²+mx+n)=x²-6x²+11x-6
化简求值 x²+6x+9/x²-9 · x-3/x+3 - 1/x+3 ,其中x²+2x=