tong cua 3 so la :
25,1 x 3 =75, 3
so thu 2 la :
( 75,3 - 7 ,6 - 7,6 - 12,1 ) : 3 = 16
so thu 3 la :
16 + 7,6 + 12,1 = 35 , 7
D/s : 35,7
35.7 là đúng 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%