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Куб суммы
1.
09.02.20222.
(a +2
b) =
(a –
2
b) =
а2 а2 а2 b2 b2 b2 2ab 2ab
+ + +
+
–
–
–
–
2ab
3.
(a +2
2
2
b) = а + 2ab + b
(a –
2 – 2ab + b2
2
а
b) =
а2
+
b2
–
–
–
2ab
4.
(– a +(a –
2
b)
(– a –
(b –
2
b)
=
2
b)
2
a)
=
=
(a +
2
b)
(b –
2
a)
5.
(– a +(a –
2
b)
(– a –
= (b –
2
a)
= (b –
2
a)
2
b)
2
b)
= (a +
2
b)