Tìm x biết

To solve these equations, we need to find the value of x that satisfies each equation. Let's solve them one by one:

1. (-2)^x = -0.5
Taking the logarithm of both sides, we get:
x * log(-2) = log(-0.5)
Since the logarithm of a negative number is undefined, this equation has no solution.

2. (-2)^x = -0.125
Taking the logarithm of both sides, we get:
x * log(-2) = log(-0.125)
Again, since the logarithm of a negative number is undefined, this equation has no solution.

3. (-8)^x = -0.125
Taking the logarithm of both sides, we get:
x * log(-8) = log(-0.125)
Again, since the logarithm of a negative number is undefined, this equation has no solution.

4. (-5)^x = 0.02
Taking the logarithm of both sides, we get:
x * log(-5) = log(0.02)
Again, since the logarithm of a negative number is undefined, this equation has no solution.

5. (-40)^x = -0.025
Taking the logarithm of both sides, we get:
x * log(-40) = log(-0.025)
Again, since the logarithm of a negative number is undefined, this equation has no solution.

Therefore, none of these equations have a solution.