X×Y=6,X2+Y2=16,则X=?,Y=?,或者X+Y=?
X×Y=6,X2+Y2=16,则X=?,Y=?,或者X+Y=?
我做对了吗.x2(x-y)+y2(y-x)= x2(x-y)-y2(x-y)=x2-y2=(x+y)(x-y)
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整数x,y满足x2-y2=2xy,求x-y/x+y的值
已知x2+y2+4x-6y+13=0