Вычислите удобным а) 3/5 : (7/60): (-3 11/15)*1 2/3 б)2 2/7*3 8/15 +1 7/15 * 2 2/7 - 72/7 *5

3/5 : 7/60 : (-3 11/15) * 1 2/3= - 3/5 * 5/3 * 60/7 * 15/56= - 60/7 * 15/56= - (15*15)/(7*14)= - 225/98= - 2 29/98

2 2/7 * 3 8/15 + 1 7/15 * 2 2/7 - 72/7 * 5=2 2/7*(3 8/15+1 7/15) - 10 2/7 * 5 =2 2/7 * 5 - 72/7 * 5=5*(2 2/7 - 10 2/7)= - 5 * 7= - 35