Ермоген
7 год назад
Решите уравнение, даю 10 баллов . (x-3)2+9(x-3)+20 = 0
ОТВЕТЫ
Seishnars
Jul 4, 2019
Пусть x - 3 = t
t^2 + 9t + 20 = 0
D= 81 - 80 = 1
t1 = ( - 9 + 1)/2 = - 8/2 = - 4;
t2 = ( - 9 - 1)/2 = - 10/2 = - 5;
x - 3 = - 4
x = - 1
x - 3 = - 5
x = - 2
t^2 + 9t + 20 = 0
D= 81 - 80 = 1
t1 = ( - 9 + 1)/2 = - 8/2 = - 4;
t2 = ( - 9 - 1)/2 = - 10/2 = - 5;
x - 3 = - 4
x = - 1
x - 3 = - 5
x = - 2
2x-6+9x-27+20=0
11x-13=0
11x=13
x=11/13
11x-13=0
11x=13
x=11/13
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