解方程：｛ x/2=y/3=z/4 x+y+z=27

题目

解方程：｛ x/2=y/3=z/4 x+y+z=27

答案

6x=4y=3z 12x+12y+12z=12*27
12x=8y
12z=16y
8y+12y+16y = 12*27
36y = 12*27
3y=27
y=9
6x=4y=4*9=36 x=6
3z=4y=4*9=36 z=12