а) 5/6*9/15:3/8=5/6*9/15*8/3=4/3=1 1/3
б) 5/12+2/3+1/9=5/12+8/12+1/9=13/12+1/9=39/36+4/36=43/36=1 7/36
а) 5/6*9/15:3/8=5/6*9/15*8/3=4/3=1 1/3
б) 5/12+2/3+1/9=5/12+8/12+1/9=13/12+1/9=39/36+4/36=43/36=1 7/36