已知3^(x+2)x5^(x+2)=15^(3x-4),求(x-1)^2-3x(x-2)-4的值

2024-12-20 16:33:42
推荐回答(1个)
回答1:

3^(x+2)x5^(x+2)=15^(3x-4),
15^(x+2)=15^(3x-4)
则:
x+2=3x-4
x=3
(x-1)^2-3x(x-2)-4
=2²-9-4
=-9