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
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
已知x和y是正整数,并且满足条件xy+x+y=71,x^2y +xy^2=880,求x^2+y^2的值
已知x和y是正整数,并且满足条件xy+x+y=71,x2y+xy2=880,求x2+y2的值.
已知x和y是正整数,且满足xy+x+y=71,x^2+xy^2=880求x^2+y^2的值
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数x,y满足条件|2x+3y+1|+(x+3y+5)²=0,求式子(-2xy)²×(-y
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知xy为自然数并且满足9x²-4y²=5求x,y的值
正整数x,y满足x2-y2=2xy,求x-y/x+y的值