【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2其中x=-2
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 17:26:08
![【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2其中x=-2](/uploads/image/z/4334919-15-9.jpg?t=%E3%80%90%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%E3%80%91%E3%80%90%EF%BC%88x%26%23178%3B-2x%2B1%EF%BC%89%E5%88%86%E4%B9%8Bx%2B%EF%BC%881-x%EF%BC%89%E5%88%86%E4%B9%8B1%E3%80%91%C3%B7%EF%BC%88x%26%23178%3B-1%EF%BC%89%E5%88%86%E4%B9%8B2%E3%80%90%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%E3%80%91%E3%80%90%EF%BC%88x%26%23178%3B-2x%2B1%EF%BC%89%E5%88%86%E4%B9%8Bx%2B%EF%BC%881-x%EF%BC%89%E5%88%86%E4%B9%8B1%E3%80%91%C3%B7%EF%BC%88x%26%23178%3B-1%EF%BC%89%E5%88%86%E4%B9%8B2%E5%85%B6%E4%B8%ADx%3D-2)
【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2其中x=-2
【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2
【先化简,再求值】
【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2
其中x=-2
【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2【先化简,再求值】【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2其中x=-2
【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2
=[x/(x-1)²-1/(x-1)×(x+1)(x-1)/2
=(x-x+1)/(x-1)×(x+1)(x-1)/2
=(x+1)/2
当x=-2时
原式=(-2+1)/2=-1/2