1) 1 4/9 • 1 5/13 = 13/9 • 18/13 = 18/9 = 2
2) 2 1/12 : 4/15 = 25/12 : 4/15 = 125/16 = 7,8125
3) 2 - 7,8125 = - 5,8125
2-5/9×4/15=2-1/9×4/3=2-1/3×4/1=2-1/4=-2ц1/4
1) 1 4/9 • 1 5/13 = 13/9 • 18/13 = 18/9 = 2
2) 2 1/12 : 4/15 = 25/12 : 4/15 = 125/16 = 7,8125
3) 2 - 7,8125 = - 5,8125