2(x-2y)²+4(2y-x)-(x-2y)²+3(x-2y),其中x=负二分之一,y=二分之一.哥哥姐姐们帮帮我
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 13:29:56
![2(x-2y)²+4(2y-x)-(x-2y)²+3(x-2y),其中x=负二分之一,y=二分之一.哥哥姐姐们帮帮我](/uploads/image/z/1773325-37-5.jpg?t=2%EF%BC%88x-2y%EF%BC%89%26%23178%3B%2B4%EF%BC%882y-x%EF%BC%89-%EF%BC%88x-2y%EF%BC%89%26%23178%3B%2B3%EF%BC%88x-2y%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D%E8%B4%9F%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%2Cy%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80.%E5%93%A5%E5%93%A5%E5%A7%90%E5%A7%90%E4%BB%AC%E5%B8%AE%E5%B8%AE%E6%88%91)
2(x-2y)²+4(2y-x)-(x-2y)²+3(x-2y),其中x=负二分之一,y=二分之一.哥哥姐姐们帮帮我
2(x-2y)²+4(2y-x)-(x-2y)²+3(x-2y),其中x=负二分之一,y=二分之一.哥哥姐姐们帮帮我
2(x-2y)²+4(2y-x)-(x-2y)²+3(x-2y),其中x=负二分之一,y=二分之一.哥哥姐姐们帮帮我
2(x-2y)²+4(2y-x)-(x-2y)²+3(x-2y)
=(x-2y)²-(x-2y)
=(x-2y)(x-2y-1)
x-2y
=-1/2-1
=-3/2
(x-2y)(x-2y-1)
=(-3/2)*(-3/2-1)
=15/4
2(x-2y)²+4(2y-x)-(x-2y)²+3(x-2y),
=﹙x-2y﹚²+4(2y-x﹚-3﹙2y-x﹚
=﹙x-2y﹚²+﹙2y-x﹚
=﹙2y-x﹚﹙2y-x+1﹚
=﹙1+½﹚﹙1+½+1﹚
=15/4
15/4