Ответ:

Пошаговое объяснение:

1.а) 5/18*9/25= 1/2*1/5= 1/10

в) 3 2/9* 1 7/29= 29/9*36/29= 1/1* 4/1= 4

1. (5/18*9/5)+5/6= (1/2*1/1)+5/6=1/2+5/6=3/6+5/6=8/6= 1 2/6= 1 1/3

(1/9+ 2 1/3)*3/11= (1/9+ 7/3)* 3/11= (1/9+21/9)*3/11= 22/9*3/11= 2/3*1/1=2/3

3.(3 1/4- 2 5/6)*4/15= (13/4- 17/6)*4/15= (39/12-34/12)*4/15= 5/12*4/15=1/3*1/3= 1/9

(4 1/18-2 2/9)*2/99= (73/18- 20/9)*2/99= (73/18- 40/18)*2/99=33/18*2/99=

1/9*1/3= 1/27