10- 2.1/2:3.3/4+(2.1/2-1.1/3)*6

Question

10- 2.1/2:3.3/4+(2.1/2-1.1/3)*6

Answer 1

10 - 2 1/2 ÷ 3 3/4 + (2 1/2 - 1 1/3) × 6 = 16 1/3
1)2 1/2 - 1 1/3 =5/2 - 4/2 =(5 × 3  -  4 × 2)/6 = 15/6  -  8/6 =  7/6 = 1 1/6
2) 2 1/2 ÷ 3 3/4 = 5/2 ÷ 15/4 =5/2  ×  4/15 =  2/3
3) 1 1/6 × 6 = 7/6 ×6 = 7
4) 10 - 2/3 = (10 × 3  -  2 × 1)/3 = 30/3  -  2/3 =  28/3 = 9 1/3
5)9 1/3 + 7 = 28/3 +7 = (28 × 1  +  7 × 3)/3 = 28/3  +  21/3 =  49/3 = 16 1/3

Answer 2

10- 2.1/2:3.3/4+(2.1/2-1.1/3)*6
10-1.05:0,825+(1.05-11/10:3)*6
10-21/20:33/40+(21/20-11/30*6
10-21/20*40/33+41/60*6
10-7*2/11+41/10*6
10-14/11+41/10
1411/110=12.8273