Ответы на вопрос:
1) а) t^2 +6t +9 =0
d = b^2 -4ac = 36-36= 0 - 1 корень
t = -b/2a = -6/2 = -3
б) t^2 +6t +9 =0
(t+3)^2 = 0
t+3 = 0
t = -3
2) z^4=4z^2
z^4 - 4z^2 = 0
z^2 * (z^2 - 4) = 0
z^2=0 или z^2 - 4 = 0
z=0 z^2 = 4
z = +-2
3) а) x^2 - 8x + 16 = 0
d = b^2 - 4ac = 64 - 16*4 = 64 - 64 = 0 - 1 корень
x = -b/2a = 8/2 = 4
б) x^2 - 8x + 16 = 0
(x+4)^2 = 0
x+4 = 0
x = -4
4) t^5 = 9t^3
t^5 - 9t^3 = 0
t^3 * (t^2 - 9) = 0
t^3 = 0 или t^2 - 9 = 0
t = 0 t^2 = 9
t = +-3
удачи!
3 - x/3 - x + 1/2 = 5x/4 3 - 1/3x - x + 1/2 = 5_1/4x -1_1/3x - 5_1/4x = -3 - 1/2 -5_3/12x-1_4/12x = -3_1/2 -6_7/12x = -3_1/2 x= -3_6/12 - (-6_7/12) x= -3_1/12 5_1/4 - пять целых одна четвёртая
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