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mathematical problem
17/72- 19/90+2 1/ 1 10-23/ 132

= ( 1/8+ 1/9)-( 1/9+ 1/ 10)+( 1/ 10+ 1/ 1 1)-( 1/ 1 1+ 1/ 12)

= 1/8+ 1/9- 1/9- 1/ 10+ 1/ 10+ 1/ 1 1- 1/ 1 1- 1/ 12

= 1/8- 1/ 12

= 1/24

3/2-7/ 12+9/20- 1 1/30+ 13/42- 15/56+ 1/8

=3/2-( 1/3+ 1/4)+( 1/4+ 1/5)-( 1/6+ 1/5)+( 1/6+ 1/7)-( 1/7+ 1/8)+ 1/8

=3/2- 1/3

=9/6-2/6

=7/6

Many: such as116,1/8,3/16,5/8.

Each segment accounts for 65,438+0, 65,438+0, 65,438+0, 65,438+0, 3,5/8 of this tree respectively.

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