5/16 ÷ 1/8 - 3 1/3 * 0,6 = 5/16 * 8/1 - 10/3 * 6/10 = 5/2 - 2/1 = (5-4)/2 = 1/2
(m + (mn)/m-n) ÷ (m - (mn)/m+n) = ( (m * (m-n) + mn)/m-n ) ÷ ( (m * (m+n) - mn)/m+n ) = ( (m² - mn + mn)/m-n ) ÷ ( (m² + mn - mn)/m+n ) = (m²/m-n) ÷ (m²/m+n) = (m²/m-n) * (m+n/m²) = (m+n)/m-n