化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 16:45:18
![化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)](/uploads/image/z/113167-55-7.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%88x%2By%29%2B%282x%2By%2F1%2A2%29%2B%283x%2By%2F2%2A3%29%2B.%2B%289x%2By%2F8%2A9%29)
化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)
化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)
化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)
(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)
=(x+2x+3x+...+9x)+(y+y/1*2+y/2*3+...+y/8*9)
=(1+9)*9x/2 +[y+(y-y/2)+(y/2-y/3)+(y/3-y/4)+...+(y/8-y/9)]
=45x+(8/9)y