vgn f1์ด ์žˆ๊ณ  vxe r1์ด ์žˆ๋˜๋ฐ ์–˜๋„ค๋“ค ํšŒ์‚ฌ๋ช…์ด ๋ญ์ž„? ๋ญ๋กœ ๊ฒ€์ƒ‰ํ•ด์•ผ ์ „์ฒด ๊ฒ€์ƒ‰ ๋จ?ย