One half plus (one third plus two thirds) plus (one fourth plus two quarters plus three quarters) plus (one fifth plus two fifths plus three fifths plus five fifths) 4 / 50) plus. Plus (1 / 50 plus. 49 / 50)

One half plus (one third plus two thirds) plus (one fourth plus two quarters plus three quarters) plus (one fifth plus two fifths plus three fifths plus five fifths) 4 / 50) plus. Plus (1 / 50 plus. 49 / 50)

1 / 2 plus (1 / 3 plus 2 / 3) plus (1 / 4 plus 2 / 4 plus 3 / 4) plus (1 / 5 plus 2 / 5 plus 3 / 5 plus 4 / 5) plus (1 / 50 plus 49 / 50)
=1/2+2/2+3/2+4/2+…… +49/2
=（1/2+49/2）×49÷2
=25×49÷2
=612.5

Two out of seven, three out of four, two out of five, three out of five, from small to large

2/7 3/4 2/5 3/5
If you can't see it, I'll give you a way
Their greatest common divisor is: 7 * 4 * 5 = 140,
So:
2/7 =40/140
3/4=105/140
2/5=56/140
3/5=84/140
So: 2 / 7

Three quarters, three fifths and three fifths are arranged from small to large

From small to large: two fifths, three fifths, three fourths

Two out of seven, two out of five, three out of four, thirty-nine, thirteen out of five, three out of five, four out of five

From large to small order:
Four out of five, three out of four, three out of five, two out of five, thirteen out of 39, two out of seven