若丨x+y-1丨与丨x-y+3丨互为相反数,则(x+y)^2007的值为多少?
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若丨x+y-1丨与丨x-y+3丨互为相反数,则(x+y)^2007的值为多少?若丨x+y-1丨与丨x-y+3丨互为相反数,则(x+y)^2007的值为多少?若丨x+y-1丨与丨x-y+3丨互为相反数,
若丨x+y-1丨与丨x-y+3丨互为相反数,则(x+y)^2007的值为多少?
若丨x+y-1丨与丨x-y+3丨互为相反数,则(x+y)^2007的值为多少?
若丨x+y-1丨与丨x-y+3丨互为相反数,则(x+y)^2007的值为多少?
因为丨x+y-1丨与丨x-y+3丨互为相反数 所以x+y+1=0 x-y+3=o 两个方程解的x=-2 y=1 所以x+y=-1 (x+y)^2007=-1
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