Question

X-100=(Y+Z)×2／13 y-100=(x+z)×9／16 z-90=(x+y)×1／3

Answer 1

整理

13x-2y-2z=1300 (1)

9x-16y+9z=-1600 (2)

x+y-3z=-270 (3)

(1)+(3)×2

15x-8z=760 (4)

(2)+(3)×16

25x--39z=-5920 (5)

(4)×5-(5)×3

77z=21560

z=280

x=(39z-5920)/25=200

y=(x+z)×9/16+100=370