Rozwiaz równania:
a.)
b.)
c.)
a) zał x≠ - 2 i x ≠ 2
3 / (x + 2) - 2 / (x - 2)(x +2) = 3(x - 2) - 2 / (x - 2)(x +2) =
[ 3(x - 2) - 2 ] / (x + 2)(x - 2) = (3x - 6 - 2) / (x - 2)(x +2) = (3x - 8 / (x^2 - 4)
b) a ≠ 0 i a ≠ 4
(2a + 1) / a(a - 4) - a / (a - 4)^2 = [(2a + 1)(a - 4) - a * a ] / a(a - 4)^2 =
(2a^2 - 8a + a - 4 - a^2)/ a(a - 4)^2 = (a^2 - 7a - 4) / a(a - 4)^2
c) x ≠ -7 i x ≠ 7
4 / ((x - 7)(x +7) + (x + 2) / (x - 7) - 1 =
4 / (x - 7)(x +7) + (x + 2) (x + 7) / (x - 7)(x + 7) - (x^2 - 49)/ (x^2 - 49) =
[ 4 + (x + 2)(x + 7) - (x^2 - 49) ] / (x^2 - 49) =
(4 + x^2 + 7x + 2x + 14 - x^2 + 49) / (x^2 - 49) =
9x + 67) / (x^2 - 49)
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a) zał x≠ - 2 i x ≠ 2
3 / (x + 2) - 2 / (x - 2)(x +2) = 3(x - 2) - 2 / (x - 2)(x +2) =
[ 3(x - 2) - 2 ] / (x + 2)(x - 2) = (3x - 6 - 2) / (x - 2)(x +2) = (3x - 8 / (x^2 - 4)
b) a ≠ 0 i a ≠ 4
(2a + 1) / a(a - 4) - a / (a - 4)^2 = [(2a + 1)(a - 4) - a * a ] / a(a - 4)^2 =
(2a^2 - 8a + a - 4 - a^2)/ a(a - 4)^2 = (a^2 - 7a - 4) / a(a - 4)^2
c) x ≠ -7 i x ≠ 7
4 / ((x - 7)(x +7) + (x + 2) / (x - 7) - 1 =
4 / (x - 7)(x +7) + (x + 2) (x + 7) / (x - 7)(x + 7) - (x^2 - 49)/ (x^2 - 49) =
[ 4 + (x + 2)(x + 7) - (x^2 - 49) ] / (x^2 - 49) =
(4 + x^2 + 7x + 2x + 14 - x^2 + 49) / (x^2 - 49) =
9x + 67) / (x^2 - 49)