a)4 2/3*3 2/3
б)3/8-4/5
в)9/25*2 1/7*1 3/9

a)

4 2/3 * 3 2/3  = 14/3 * 11/3 = 154/9 = 17 1/9,

б)

3/8 - 4/5  = 15/40 - 32/40 = 17/40,

в)

9/25 * 2 1/7 * 1 3/9 = 9/25 * 15/7 * 12/9 = 36/35 = 1 1/35

4 2/3*3 2/3=14/3*8/3=112/9=12 4/9

3/8-4/5=15/40-32/40=-17/40

9/25*2 1/7*1 3/9=9/25*15/7*12/9=36/35=1  1/35