wszystko w zaloczniku
1)
2) (2-√2)(3√3 - x) = 4 - 2√26√3 - 2x-3√6 + x√2 = 4√2
-2x + x√2 = -2√2 + 6√3 - 3√6
x(-2 +√2) =
3) -7 < x ≤ -1
-1, -6
4) (3a - 2)² - 2(a + 2)(a - 2)=
9a²- 12a + 4 - 2(a² - 4) =
9a² - 12a + 4 - 2a² + 8 =
7a² - 14a + 12 =
7 x (-√3) - 14 x (-√3) + 12 =
-7√3 + 14√3 + 12 =
7√3 + 12
5) 140%x = 420 :1,4
x = 300
300 x 97% = 300 x 0,97 = 291
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1)
2) (2-√2)(3√3 - x) = 4 - 2√2
6√3 - 2x-3√6 + x√2 = 4√2
-2x + x√2 = -2√2 + 6√3 - 3√6
x(-2 +√2) =
3) -7 < x ≤ -1
-1, -6
4) (3a - 2)² - 2(a + 2)(a - 2)=
9a²- 12a + 4 - 2(a² - 4) =
9a² - 12a + 4 - 2a² + 8 =
7a² - 14a + 12 =
7 x (-√3) - 14 x (-√3) + 12 =
-7√3 + 14√3 + 12 =
7√3 + 12
5) 140%x = 420 :1,4
x = 300
300 x 97% = 300 x 0,97 = 291