先化简,再求值.(要有过程)急!4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三5x²y²+1/4xy-2x²y²-1/6xy-3x²y²,其中x=3,y=﹣4
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/16 20:00:44
![先化简,再求值.(要有过程)急!4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三5x²y²+1/4xy-2x²y²-1/6xy-3x²y²,其中x=3,y=﹣4](/uploads/image/z/2590216-16-6.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC.%EF%BC%88%E8%A6%81%E6%9C%89%E8%BF%87%E7%A8%8B%EF%BC%89%E6%80%A5%214a%26%23178%3B-3a%26%23179%3B-2a-6%2Ba%26%23179%3B%2B3a-7%2B2a%26%23179%3B%2C%E5%85%B6%E4%B8%ADa%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%894a%26%23178%3B-3a%26%23179%3B-2a-6%2Ba%26%23179%3B%2B3a-7%2B2a%26%23179%3B%2C%E5%85%B6%E4%B8%ADa%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%895x%26%23178%3By%26%23178%3B%2B1%2F4xy-2x%26%23178%3By%26%23178%3B-1%2F6xy-3x%26%23178%3By%26%23178%3B%2C%E5%85%B6%E4%B8%ADx%3D3%2Cy%3D%EF%B9%A34)
先化简,再求值.(要有过程)急!4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三5x²y²+1/4xy-2x²y²-1/6xy-3x²y²,其中x=3,y=﹣4
先化简,再求值.(要有过程)急!4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三
4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三
5x²y²+1/4xy-2x²y²-1/6xy-3x²y²,其中x=3,y=﹣4
先化简,再求值.(要有过程)急!4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三4a²-3a³-2a-6+a³+3a-7+2a³,其中a=二分之三5x²y²+1/4xy-2x²y²-1/6xy-3x²y²,其中x=3,y=﹣4
4a²-3a³-2a-6+a³+3a-7+2a³
=(-3+1+2)a³+4a²+(-2+3)a-13=4a²+a-13=-5/2(a=二分之三)
5x²y²+1/4xy-2x²y²-1/6xy-3x²y²=(5-2-3)x²y²+(1/4-1/6)xy=1/12 xy=-1(x=3,y=﹣4)