若xy互为相反数,求x+2x+3x+...+100x+100y+99y+98y+,+2y+y的值
若|2x+y-3|与(y-2)²互为相反数,求4x²y-3xy的值?
若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值?
若|3-x|与|x+y|互为相反数,求(x-y)/xy的值.
已知|x+3y+6|与|2x-y+5|互为相反数,求(x+y)-xy的值
已知|x+3y+6|与|2x-y+5|互为相反数,求x+y-xy的值
若|x+y|与|2y-3|互为相反数,求2x+y的值
若|x+y|与|2y-3|互为相反数,求2x+y的值.
已知|x-y+3| 根号2x+y互为相反数求x+y的值
若|X-3|与|Y+2|互为相反数,求x+y+99的值!
已知x与y互为相反数,且(2x+y)(2y+x)等于2011,求xy的值
答好送100分已知|x-y|与(y+x)互为相反数,求x+y的值
若|x-y+3|与|x+y-1999|互为相反数,求x+2yx−y