把x=y+3代入3x+2y=14
3(y+3)+2y=14
3y+9+2y=14
y=1 x=4
(x/3)*12-(y/4)*12=1*12
4x-3y=12
4x-3y+3x-4y=12+2
7x-7y=14
x-y=2
代入得:x=6&...