What's the ratio of 1-6:5 + 12:7-20:9 + 30:11-42:13 + 56:15-72:17

What's the ratio of 1-6:5 + 12:7-20:9 + 30:11-42:13 + 56:15-72:17

5 of 1-6, 7 of 12, 9 of 20, 11 of 30, 13 of 42, 15 of 56, 17 of 72 = 1 - (1 / 2 + 1 / 3) + (1 / 3 + 1 / 4) - (1 / 4 + 1 / 5) + (1 / 5 + 1 / 6) - (1 / 6 + 1 / 7) + (1 / 7 + 1 / 8) - (1 / 8 + 1 / 9) = 1-1 / 2-1 / 3 + 1 / 3 + 1 / 4-1 / 4-1 / 5 + 1 / 6-1 / 7 + 1 / 8-1 / 9 = 1-1 / 2-1 / 9

8 / 9 + 1 and 3 / 7 + 6 / 11) / (3 / 11 + 4 / 9-5 / 7)
Simple calculation

8 / 9 + 1 and 3 / 7-6 / 11) / (3 / 11 + 4 / 9-5 / 7)
=(8/9+10/7-6/11)/(3/11+4/9-5/7)
=(2*4/9+2*5/7-2*3/11)/(3/11+4/9-5/7)
=2*(3/11+4/9-5/7)/(3/11+4/9-5/7)
=2

36 × 4 / 9 ÷ 8 / 11

36 × 4 / 9 ÷ 8 / 11
=16 × 11 / 8
=22

1/2×3/4×5/6×7/8×9/10×11/12×13/14…… Which is larger than the product of x 35 / 36 and 1 / 6?

Zoom in:
1/2×3/4×5/6×7/8×9/10×11/12×13/14…… X 35 / 36 square