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2² + 2*2*3√2 + (3√2)² - 2(√4 + 3√2 - 3√2 - 9) - 3(√2² - 2*√2*2 + 2²) =
4 + 12√2 + 18 - 2√4 - 6√2 + 6√2 + 18 - 3(2 - 4√2 + 4) =
4 + 12√2 + 18 - 2*2 - 6√2 +6√2 + 18 - 6 + 12√2 - 12 =
4 + 12√2 + 18 - 4 - 6√2 + 6√2 + 18 - 6 + 12√2 - 12 =
18 + 24√2
2.
(2√3)² - 2*2√3*3 + 3² - 9 + 3√3 =
4*3 - 12√3 + 9 - 9 + 3√3 =
12 - 12√3 + 9 - 9 + 3√3 =
12 - 9√3
3.
(2√3)² - 2*2√3*2a + (2a)² =
4*3 - 8√3a + 4*a² =
12 - 8√3a + 4a² =
4a² - 8√3a + 12
4.
(2√3)² - 2*2√3*4a + (4a)² =
4*3 - 16√3a + 16a² =
12 - 16√3a + 16a² =
16a² - 16√3a + 12
Używasz tu głównie wzoru skróconego mnożenia :)
= 22+12√2 - 2(-7 ) -3 (6 -4√2)=
= 22+12√2 +14 -18+ 12√2= 18 +24√2
2. ( 2√3-3)²- 3(3-√3)=
=(12 -12√3√+9 ) - 3(3-√3)=
= 21 -12√3 - 9 +3√3=
= 12 +9√3
3. (2√3-2a)²=
=12 -8√3a + 4a²=
=4a²-8√3a +12
4. ( 2√3-4a)² =
= 12√3 - 16√3a +16a²=
= 16a² -16√3a+12√3