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The eighth grade optimization design, the first volume of mathematical answers
DB is 10 meter, and the walking distance of two monkeys is 15 meter.

BC is 5 million.

Let AD be xm and AC be (15-x) m.

5? +( 10+x)？ =( 15-x)？

25+ 100+20x+x？ =225-30x+x？

50x= 100

x=2

∴AB=AD+DB

=2+ 10

= 12m

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