Question

(2,5)в степени -2+5в степени -3*20

Answer 1

1)  2,5 =5/2
         (5/2)^(-2)=(2/5)² =4/25

2)   20*5^(-3)=20/125=4/25

3)     4/25+4/25=8/25= 0,32

Answer 2

To simplify this expression, we need to first calculate the values of 2.5 to the power of -2 and 5 to the power of -3:

2.5^(-2) = 1 / 2.5^2 = 1 / 6.25 = 0.16

5^(-3) = 1 / 5^3 = 1 / 125 = 0.008

Now we can substitute these values into the expression:

2.5^(-2) + 5^(-3) * 20 = 0.16 + 0.008 * 20

= 0.16 + 0.16

= 0.32

Therefore, the value of the expression is 0.32.