Đáp án:
Ta có :
`(x-1)/2=(y+3)/4=(z-5)/6 = (3x - 3)/6 = (4y+12)/16 = (5z-25)/30 = (5z-25 - 3x + 3 - 4y -12 )/(30-6-16)`
`= ((5z-3x-4y)+(-25 + 3 -12))/8 = (45 - 34 )/8 = 11/8 `
`+, (x-1)/2 = 11/8 -> 8x - 8 = 22 -> 8x = 30 -> x = 15/4`
`+, (y+3)/4 = 11/8 -> 8y+ 24 = 44 -> 8y = 20 -> y = 5/2`
`+, (z-5)/6 = 11/8 -> 8z-40 = 66 -> 8z = 106 -> z = 53/4`
Vậy `(x,y,z) = (15/4 ; 5/2 ; 53/4)`
`Go od luck!`