Question

7ab^2/a^2-25b^2*a-5b/ab при а=0.5, b=0.4

Answer 1

-1,36 наверно так я просто подставил. Если только это не дроби...

Answer 2

Before we can substitute the values of a and b, we should simplify the expression:

7ab^2 / (a^2 - 25b^2) * a - 5b / ab

Multiplying by a / a, we get:

(7a^2 b^2) / (a^3 - 25ab^2) - 5b^2 / a^2b^2

Now we can substitute the values of a and b:

a = 0.5, b = 0.4

(7 * 0.5^2 * 0.4^2) / (0.5^3 - 25 * 0.5 * 0.4^2) - 5 * 0.4^2 / (0.5^2 * 0.4^2)

Simplifying:

(7 * 0.5^2 * 0.4^2) / (0.5^3 - 25 * 0.5 * 0.4^2) - 5 / 0.5

= 0.392 / 0.018 - 10

= 21.78 - 10

= 11.78

Therefore, when a=0.5 and b=0.4, the value of the expression is 11.78.