
化简求值:1/x+1-x+3/x的平方-1+x的平方+4x+3/x的平方-2x+1,其中x=-3
展开全部
原式=1/(x+1)-(x+3)/(x+1)(x-1)+(x²+4x+3)/(x-1)²
=[(x-1)²-(x+3)(x-1)+(x+1)(x²+4x+3)]/(x+1)(x-1)²
=(x²-2x+1-x²-2x+3+x³+5x²+7x+3)/(x+1)(x-1)²
=(x³+5x²+3x+7)/(x+1)(x-1)²
=(-27+45-9+7)/(-2)*16
=-1/2
=[(x-1)²-(x+3)(x-1)+(x+1)(x²+4x+3)]/(x+1)(x-1)²
=(x²-2x+1-x²-2x+3+x³+5x²+7x+3)/(x+1)(x-1)²
=(x³+5x²+3x+7)/(x+1)(x-1)²
=(-27+45-9+7)/(-2)*16
=-1/2
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询