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