2 3/11 × 2 7/15 - 2 3/11 × 7/10 + 1 1/6 × 2 3/11
25/11 × 2 × 7/15 - 25/11 × 7/10 + 7/6 × 2 × 3 /11
5/11 × 2 × 7/3 - 5/11 × 7/2 + 7/3 × 3/11
70/33 - 35/22 + 7 × 1/11
70/33 - 35/22 + 7/11 = 7/6
2 3/11 × 2 7/15 - 2 3/11 × 7/10 + 1 1/6 × 2 3/11
25/11 × 2 × 7/15 - 25/11 × 7/10 + 7/6 × 2 × 3 /11
5/11 × 2 × 7/3 - 5/11 × 7/2 + 7/3 × 3/11
70/33 - 35/22 + 7 × 1/11
70/33 - 35/22 + 7/11 = 7/6