a) -2 1/3 * (-9/7) = -7/3 * (-9/7) = 63/21 = 3
б) 6 1/4 * (-1 3/5) = 25/4 * (-8/5) = -200/20 = -10
в) -3 1/7 * 4 8/11 = -22/7 * 52/11 = -1144/77 = -14 66/77 = -14.85714285714
г) -2 2/5 * 3.4 = -12/5 * 3.4 = -40.8/5 = -8.16
д) 2.2 * (-1 3/7) = 2.2 * (-10/7) = -22/7 = -3.14285714285
e) -1 7/9 * (-6.75) = -16/9 * (-6.75) = 108/9 = 12