分式加减 x²+3x-4分之2x - x-1分之x+1 +1快.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 05:35:58
![分式加减 x²+3x-4分之2x - x-1分之x+1 +1快.](/uploads/image/z/469450-10-0.jpg?t=%E5%88%86%E5%BC%8F%E5%8A%A0%E5%87%8F+x%26%23178%3B%2B3x-4%E5%88%86%E4%B9%8B2x+-+x-1%E5%88%86%E4%B9%8Bx%2B1+%2B1%E5%BF%AB.)
分式加减 x²+3x-4分之2x - x-1分之x+1 +1快.
分式加减 x²+3x-4分之2x - x-1分之x+1 +1快.
分式加减 x²+3x-4分之2x - x-1分之x+1 +1快.
原式=2x/(x²+3x-4)-(x+1)/(x-1)+1
=2x/[(x-1)(x+4)]-(x+1)(x+4)/[(x-1)(x+4)]+(x-1)(x+4)/[(x-1)(x+4)]
=[2x-(x+1)(x+4)+(x-1)(x+4)]/[(x-1)(x+4)]
=(2x-x²-5x-4+x²+3x-4)/[(x-1)(x+4)]
= -8/[(x-1)(x+4)]
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