x,y互为相反数,则x+2x+3x+.+2006x+2007x+2007y+2006y+.+3y+2y+y等于
|3x+5y-13|和(5x+3y-11)^2互为相反数,则x+y等于多少
已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3
已知(x-2)的平方和y-3的绝对值互为相反数,则x+y等于?
若|x-y+3|与|x+y-1999|互为相反数,求x+2yx−y
已知|x-y+3| 根号2x+y互为相反数求x+y的值
若x,y互为相反数(y≠0),则2x+5+2y+3x/y=____
若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值?
已知|x+5|与(x+2y-3)^2互为相反数,则x= y=
已知方程2x加3y等于二当x与y互为相反数,求x,y的值.
若x和y互为相反数,则3x-10+3y+y/5x=
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若|x+y|与|2y-3|互为相反数,求2x+y的值