19/10/12 18:09:08 hFZo15fW.net
a≧b≧c≧d
また
0 = 4a - (a+b+c+d) = (a-b) + (a-c) + (a-d) ≧0,
1 = abcd/(d^4) = (a/b)(b/d)(c/d) ≧ 1,
19/10/12 18:09:08 hFZo15fW.net
a≧b≧c≧d
また
0 = 4a - (a+b+c+d) = (a-b) + (a-c) + (a-d) ≧0,
1 = abcd/(d^4) = (a/b)(b/d)(c/d) ≧ 1,