Sprowadź do najprostszej postaci:
(√2 - 1)(2 + √2 / 2)² - √2(2 + √2 / 2) + 1
(√2 - 1)(2 + √2 / 2)² - √2(2 + √2 / 2) + 1=
Korzystam ze wzoru skróconego mnożenia (a +b)² = a² +2ab +b²
=(√2 - 1)( 4 + 2√2 +1/2) - 2√2 - 1 +1 =
=(√2 - 1)(2√2 + 9/2) - 2√2 =
=4 + 9/2*√2 - 2√2 - 9/2 -2√2 =
= 8/2 +9/2√2 - 4/2√2 -9/2 -4/2√2 =
=9/2√2 -8/2√2 + 8/2 -9/2 =
= 1/2√2 -1/2 =
= 1/2(√2 -1)
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Sprowadź do najprostszej postaci:
(√2 - 1)(2 + √2 / 2)² - √2(2 + √2 / 2) + 1=
Korzystam ze wzoru skróconego mnożenia (a +b)² = a² +2ab +b²
=(√2 - 1)( 4 + 2√2 +1/2) - 2√2 - 1 +1 =
=(√2 - 1)(2√2 + 9/2) - 2√2 =
=4 + 9/2*√2 - 2√2 - 9/2 -2√2 =
= 8/2 +9/2√2 - 4/2√2 -9/2 -4/2√2 =
=9/2√2 -8/2√2 + 8/2 -9/2 =
= 1/2√2 -1/2 =
= 1/2(√2 -1)