C
congtungok


Cho B=(1/4-1).(1/9-1)......(1/100-1). So sánh B với -11/21
:khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (36)::khi (36)::khi (36)::khi (36)::khi (36)::khi (68)::khi (68)::khi (61):=>:khi (64):=>:khi (20):
:khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (111)::khi (36)::khi (36)::khi (36)::khi (36)::khi (36)::khi (68)::khi (68)::khi (61):=>:khi (64):=>:khi (20):