A²+ B'² + C²
(3) (a-b)³+(b-c)³ + (c-a)³
=
{(a-h) + (hc) {.(a-ujª — (a-^^) ( ^_c) + (h-c;³4 +(c-a)³
(a-c) la-2ah+ - (Ali-ac-li²+ hc) + h²-2hc + c^4 + (c-a)³
=
= (a-c) (a²-zah+lª - Ah + ac + li_hc + li²-2hc + c²4+ (c-a) ³
(a-c) (A²+ 3² + C² - 3ah-3hc +ca) + (c-a) (c²+ +
+ac+a ²))
ac + a²),
=
(a-c) (c²+actat)"
-
(a-c) (a²+ 3+ c² - 3ah -3kc+ (a)
=
(a-c) [a²+3 litc²-3ah-3hc + ca - (c²+ac+ a²) G
=
=la-C) Cả 3 Bal-3hc trả các đ
= (a-c) (34²- 3ah-3hc)
= 3h (a-c) ( h-A-C)
= -3h(a-h+c) (a-c)
サ
= (A+B) (A²-AB+B)
+ c³
入れ替え
