Задача 35700 1) 25^(x-2) / sqrt(5) - (1/5)^(x-7.5) =...

vk448506043

2019-04-11 13:50:17

1) 25^(x-2) / sqrt(5) - (1/5)^(x-7.5) = 0

2) 8 / (sqrt(2))^x = 4^(3x-2) * sqrt(2)

3) 9^(1/2 x - 1) - 3 = 0

4) 27^(3 - 1/3 x) - 81 = 0

sova

2019-04-11 14:05:00

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1.
5^((2x-4)-(1/2))-5^(-x+7,5)= [b]0[/b]

5^(2x-4,5)=5^(-x+7,5)

2x-4,5=-x+7,5

3x=12

[b]x=4[/b]

2.
2^(3-(x/2))=2^((6x-4)+(1/2))

3-(x/2)=6x-4+(1/2)

13x=13

[b]x=1[/b]

3.
3^(2*(1/2x)-2)=3

1/x-2=1

1/x=3

[b]x=1/3[/b]

4.

3^(9-x)=3^(4)

9-x=4

[b]x=5[/b]