Question

5ab/(5ab-8a*) при а=3,b=8

Answer 1

$\frac{5ab}{5ab-8a}=\frac{5ab}{a(5b-8)}=\frac{5b}{5b-8}\\\\\frac{5*8}{5*8-8}=\frac{40}{40-8}=\frac{40}{32}=1,25$

Answer 2

To evaluate the expression 5ab / (5ab - 8a*), substitute the values of a and b:

Given: a = 3, b = 8

Now, let's substitute the values:

5ab / (5ab - 8a*) = 5 * 3 * 8 / (5 * 3 * 8 - 8 * 3*) = 120 / (120 - 24) = 120 / 96 = 5/4

Therefore, when a = 3 and b = 8, the value of the expression is 5/4 or 1.25.