- 36 名前：１３２人目の素数さん mailto:sage [2018/09/18(火) 10:02:34.07 ID:VmGjAMY2.net]
- >>9
43/3 = a とおく。
0 = x^3 + y^3 - (xx+42xy+yy)
= {x+y+(42-2a)}{xx-xy+yy -a(x+y) +a(42-2a)} - a(42-2a)^2
= X^3 + Y^3 +42(XX-XY+YY) -a(X+Y) -aa(4a-42)
= (X+Y+42)(XX-XY+YY -a) - a(42-2a)^2,
ここに、X = x-a, Y = y-a,
漸近線： x+y+(42-2a)=0 (X+Y+42=0)
>>33
4(x^3 + y^3) - (x+y)^3 = (x+y){4(xx-xy+yy) -(x+y)^2}
= (x+y){3(x-y)^2}
≧ 0
