已知│x2-9│+(2x+y)2=0,求x+y的值
已知x2-2x+y2+6y+10=0,求多项式(2x+y)(2x-y)+(x+y)2-2(2x2-xy)的值
已知x2-2x+y2+6y+10=0,求(2x-y)的值
已知:x2+2x+y2-6y+10=0,求x,y的值.
已知x2+4x+y2-2y+5=0,求x,y的值.
已知:x2+y2-10x-2y+26=0,求x、y的值.
已知x2+y2+2x-6y+10=0,求x+y的值.
已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值
已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值
已知x2-4x-1=0,求代数式(2x-3)2-(x+y)(x-y)-y2的值
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
已知x2+y2-2xy-6x+6y+9=0,求x-y的值
已知实数x,y满足x2+y2-4x+1=0,求2x+y的取值范围?