x asia: wyznacz następujące sumy|:

2		2		2		2
	+		+		+...+
1*3		3*5		5*7		19*21

Umiem to obliczyć ,tak na "chłopski "rozum i wiem jaki jest wynik,ale proszę o wzór,,,

ZKS:

1		A		B		Ax + 2A + Bx		(A + B)x + 2A
	=		+		=		=
x(x + 2)		x		x + 2		x(x + 2)		x(x + 2)

	1
{A + B = 0 ⇒ B = −
	2

	1
{2A = 1 ⇒ A =
	2

1		1		1
	=		−
x(x + 2)		2x		2(x + 2)

asia: dziękuję

ZKS: Proszę. Mam nadzieję że wiesz jaka jest odpowiedź.

asia:

	10
wiem,wiem
	21

opczajacz stron wazne.pl: 1 A B Ax + 2A + Bx (A + B)x + 2A −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− = −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− + −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− = −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− = −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− x(x + 2) x x + 2 x(x + 2) x(x + 2) 1 {A + B = 0 ⇒ B = − −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 2 1 {2A = 1 ⇒ A = −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 2 1 1 1 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− = −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− − −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− x(x + 2) 2x 2(x + 2)

ZKS:

	20
Ale odpowiedź według mnie to		.
	21

asia:

	20
naturalnie,że
	21

adam: ZKS − Twoje rozwiązanie jest dla mnie bardzo przydatne.