4·(2ˣ)²-13·2ˣ·3ˣ+9·(3ˣ)²=0 разделим на (3ˣ)²
4((2/3)ˣ)²-13·(2/3)ˣ+9=0 (2/3)ˣ=t
4t²-13t+9=0
D=169-144=25
t₁=(13-5)/8=1 t₂=(13+5)/8=9/4
(2/3)ˣ=1 x=0
(2/3)ˣ=(3/2)² (2/3)ˣ=(2/3)⁻² x=-2
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
4·(2ˣ)²-13·2ˣ·3ˣ+9·(3ˣ)²=0 разделим на (3ˣ)²
4((2/3)ˣ)²-13·(2/3)ˣ+9=0 (2/3)ˣ=t
4t²-13t+9=0
D=169-144=25
t₁=(13-5)/8=1 t₂=(13+5)/8=9/4
(2/3)ˣ=1 x=0
(2/3)ˣ=(3/2)² (2/3)ˣ=(2/3)⁻² x=-2