31/7*7/1 -1 5/6*3=31-1 5/6*3
=31-11/6*3/1=31-11/2=62/2-
-11/2= 51/3=17
1метр =100сантиметров
Тогда 3метра=300сантиметров
300+2=302сантиметра
-6+4 5/8=-1 3/8
-2/9 +5/6=-8/36+30/36=22/36=11/18
2 21/26+(-3 4/13)=73/26-43/13=73/26-86/26=-13/26=-1/2
8,5(остаток)......................