啊..若︱x-y+3︱与︱x+y-1999︱互为相反数,求(x+2y)/(x-y)的值
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啊..若︱x-y+3︱与︱x+y-1999︱互为相反数,求(x+2y)/(x-y)的值啊..若︱x-y+3︱与︱x+y-1999︱互为相反数,求(x+2y)/(x-y)的值啊..若︱x-y+3︱与︱x
啊..若︱x-y+3︱与︱x+y-1999︱互为相反数,求(x+2y)/(x-y)的值
啊..若︱x-y+3︱与︱x+y-1999︱互为相反数,求(x+2y)/(x-y)的值
啊..若︱x-y+3︱与︱x+y-1999︱互为相反数,求(x+2y)/(x-y)的值
x-y=-3,x+y=1999.
啊..若︱x-y+3︱与︱x+y-1999︱互为相反数,求(x+2y)/(x-y)的值
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