s+1除3 + s+1除7=-6

(s+1)/3 + (s+1)/7=-6
(7s+7)/21 + (3s+3)/21=-6
(10s+10)/21=-6
10s+10=-6*21
10s=-126-10
10s=-136
s=-13.6

2006-10-19 15:55:48 補充：
OR~~s+1/3+s+1/7=-62s+7/21+3/21=-62s+10/21=-62s=-6-10/212s=-(6+10/21)s=-(3+5/21)

s+1除3 + s+1除7=-6
2s+1/3+1/7=-6
2s+(7+3)/21=-6
2s=-6 - 10/21
42s=-16
s= - 8/21

s+1/4+s* 1/7=-6
s+1/7s+28=-6
s+1=-42s-168
s=-42s-169
43s=-169
s=-169/43

s+1除3 + s+1除7=-6
7s+7除21 + 3s+3除21=-126除21
7s+7+3s+3=-126
10s+10=-126
10s=-136
s=-13.6

s+(1除3) + s+(1除7)=-6