(1 9/16 × 3 1/5 + 6 2/3 - 9 : 2 2/5) : (17 7/12 - 6 1/3)

( 1 9/16* 3 1/5 + 6 2/3 - 9 : 2 2/5):(17 7/12 - 6 1/3)=19/27решим по действиям:1) 1 9/16 * 3 1/5 = (25*16)/(16*5)=5;2)9:2 2/5=(9*5)/12=45/12=15/4=3 3/4;3)5+6 2/3=11 2/3;4)11 2/3 - 3 3/4 =11 8/12 -3 9/12=10 20/12 - 3 9/12= 7 11/12;5)17 7/12 - 6 1/3= 17 7/12 - 6 4/12=11 3/12= 11 1/4;6)7 11/12 : 11 1/4 = 95/12 : 45/4 = (95*4)/(12*45)=95/135=19/27Ответ: 19/27.