√(5x+2y-10-m)+√(3x+4y-m)=√(x+y-5)•√(5-x-y),√(x+y-5)>=0,√(5-x-y)>=0x+y-5与5-x-y是互为相反数,又都是非负数,所以,x+y-5=5-x-y=0x+y=5同理,√(5x+2y-10-m)>=0,√(3x+4y-m)>=0√(5x+2y-10-m)+√(3x+4y-...