己知正整数x、y,满足1/x+1/y=1/7,求x、y

己知x,y, z都是非零有理数,且满足|x|/x+|y|/y+z/|z|=1,请你求xyz/|x 己知x,y,z都是非零有理数,且满足|x|/x+|y|/y+z/|z|=1,请你求xyz/|xyz|的值.求因为所以? 已知x,y是正整数,并且满足条件xy+x+y+1=71,x²y+xy²=880,求x²+y x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y 己知x平方+3xy一4y平方=0(y≠0)求代数式(1)y分之x(2)x+y分之x一y 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 一条分式数学题已知x y z满足x/x+y + y/z+x + z/x+y =1,求x²/x+y + y&su 已知实数x,y满足方程x*x+y*y-4x+1=0.求y-x的最大值 已知正整数x,y满足2∧x 49=y,求x,y值 正整数x,y满足x2-y2=2xy,求x-y/x+y的值 已知有理数x,y满足1/2|x-y|+|y-1/2|=0 求3x+7y 已知x、y满足二分之一,｜x-y｜+｜1-y｜=0,求7x-3y的值