先化简再求值:x²-1/(x-3)÷x²+2x+1/(x²-2x-3)-2,然后选取一个你喜欢的数值代入.
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 15:35:25
![先化简再求值:x²-1/(x-3)÷x²+2x+1/(x²-2x-3)-2,然后选取一个你喜欢的数值代入.](/uploads/image/z/2768656-40-6.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9Ax%26%23178%3B-1%2F%EF%BC%88x-3%EF%BC%89%C3%B7x%26%23178%3B%2B2x%2B1%2F%EF%BC%88x%26%23178%3B-2x-3%EF%BC%89-2%2C%E7%84%B6%E5%90%8E%E9%80%89%E5%8F%96%E4%B8%80%E4%B8%AA%E4%BD%A0%E5%96%9C%E6%AC%A2%E7%9A%84%E6%95%B0%E5%80%BC%E4%BB%A3%E5%85%A5.)
先化简再求值:x²-1/(x-3)÷x²+2x+1/(x²-2x-3)-2,然后选取一个你喜欢的数值代入.
先化简再求值:x²-1/(x-3)÷x²+2x+1/(x²-2x-3)-2,然后选取一个你喜欢的数值代入.
先化简再求值:x²-1/(x-3)÷x²+2x+1/(x²-2x-3)-2,然后选取一个你喜欢的数值代入.
原式=(x+1)(x-1)/(x-3)*(x-3)(x+1)/(x+1)²-2
=(x+1)(x-1)/(x-3)*(x-3)/(x+1)-2
=x-1-2
=x-3
令x=5
原式=5-3=2