Объяснение:
...............................
Метод введения новой переменной
2(10x−13)^2−9(10x−13)+9=0
(10x−13) = t
2t^2 - 9t + 9 = 0
D = 81 - 8*9 = 9
t₁₂ = (9 +- 3)/4 = 3 3/2
1. t₁ = 3
10x - 13 = 3
10x = 16
x₁ = 16/10 = 8/5
2. t₂ = 3/2
10x - 13 = 3/2
10x = 29/2
x₂ = 29/20
Объяснение:
...............................
Метод введения новой переменной
2(10x−13)^2−9(10x−13)+9=0
(10x−13) = t
2t^2 - 9t + 9 = 0
D = 81 - 8*9 = 9
t₁₂ = (9 +- 3)/4 = 3 3/2
1. t₁ = 3
10x - 13 = 3
10x = 16
x₁ = 16/10 = 8/5
2. t₂ = 3/2
10x - 13 = 3/2
10x = 29/2
x₂ = 29/20