丨x-y+3丨与丨x+y-1999丨互为相反数,求x-y分之x+y的值.
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丨x-y+3丨与丨x+y-1999丨互为相反数,求x-y分之x+y的值.
丨x-y+3丨与丨x+y-1999丨互为相反数,求x-y分之x+y的值.
丨x-y+3丨与丨x+y-1999丨互为相反数,求x-y分之x+y的值.
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