Question

Jason

求解這題，答案是2,3，謝謝

若x,y,z均為實數,滿足√x²−20x+100+√ y?−60y+900+ z㎡-100y+2500=5, 則
vx²−2xy+y²+ −2yz+z² 的值可能為下列哪些選項?
(1) 25
(3) 45
(5) 65
(2) 35
(4) 55