(971,1÷23,4-211,14÷6,9)×(6,5704÷0,86)

First let's simplify the expression inside the parentheses:
971.1 ÷ 23.4 = 41.5
211.14 ÷ 6.9 = 30.6

Now we have:
(41.5 - 30.6) × (6.5704 ÷ 0.86)

Simplify further:
(10.9) × (7.63627907)

Finally, multiply the two numbers:
83.798207

Therefore, (971.1 ÷ 23.4 - 211.14 ÷ 6.9) × (6.5704 ÷ 0.86) = 83.798207.