1、根号m+根号n分之m+n+2根号mn
=(根号m+根号n)^2/(根号m+根号n)
=根号m+根号n
2、根号a+根号b分之根号a-根号b
=(根号a-根号b)^2/(根号a+根号b)(根号a-根号b)
=(根号a-根号b)^2/(a-b)
3、根号x-根号y分之(x根号x)-(y根号y)
=[(根号X-根号Y)][x+根号XY+y]/(根号X-根号Y)
=X+根号XY+Y
1、根号m+根号n分之m+n+2根号mn
=(根号m+根号n)^2/(根号m+根号n)
=根号m+根号n
2、根号a+根号b分之根号a-根号b
=(根号a-根号b)^2/(根号a+根号b)(根号a-根号b)
=(根号a-根号b)^2/(a-b)
3、根号x-根号y分之(x根号x)-(y根号y)
=[(根号X-根号Y)][x+根号XY+y]/(根号X-根号Y)
=X+根号XY+Y