√(1 13/36)* (-2)² - 1,1 : 2 1/5= √49/36 * 4 - 11/10 : 11/5= 7/6 * 4 -11/10 * 5/11 = 7/3 * 2 - 10/5 = 14/3 - 2 = 4 2/3 - 2= 2 2/3