Question

请问可以帮我回答必修二的数学题吗?

Answer 1

| MA|=| MB|

故| MA|^2=| MB|^2

故（x-1)^2+(y-2)^2+4^2=(x-2)^2+(y-3)^2+4^2

即x^2-2x+1+y^2-4y+4+16=x^2-4x+4+y^2-6y+9+16

可得2x+2y=8即x+y=4