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:2024/07/13 06:27:28
![化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)](/uploads/image/z/211558-22-8.jpg?t=%E5%8C%96%E7%AE%80%3A%EF%BC%88x%2By%EF%BC%89%2B%282x%2By%2F1%2A2%29%2B%283x%2By%2F2%2A3%29%2B...%2B%289x%2By%2F8%2A9%29)
x){3{:*+02
45AL#-cMm===m
KBR&HLv67~mG
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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)
原式=X+2X+……+9X+Y+Y/1×2+Y/2×3+……+Y/8×9
=(1+9)×9X÷2+Y+Y-1/2Y+1/2Y-1/3Y+……+1/8Y-1/9Y
=45X+17/9Y
当X=2 Y=9时原式=107
这个我也不太懂~~抱歉~~~