a+b+c+d+e+f+g=25 (1)
e+c=2c+2g (2)
f=b+a+d+1 (3)
f=e+g (4)
(2)
e=c+2g (5)
(3)(4)
e=f-g=b+a+d+1-g (6)
(5)+(6)
2e=a+b+c+d+g+1
2e-1=a+b+c+d+g (7)
(7) (1)
2e-1+e+f=25
3e+f=26 (8)
再往下就不会了
a+b+c+d+e+f+g=25 (1)
e+c=2c+2g (2)
f=b+a+d+1 (3)
f=e+g (4)
(2)
e=c+2g (5)
(3)(4)
e=f-g=b+a+d+1-g (6)
(5)+(6)
2e=a+b+c+d+g+1
2e-1=a+b+c+d+g (7)
(7) (1)
2e-1+e+f=25
3e+f=26 (8)
再往下就不会了