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Mathematics training in the sixth grade experimental class (1) The last question on page 32 of Jiangsu Edition of the national standard: answer+problem solving ideas
(* is multiplication, numerator/denominator)

20-20*( 1- 1/2)*( 1- 1/3)*( 1- 1/4)*......*( 1- 1/ 10)

=20-20* 1/2*2/3*3/4*4/5........9/ 10

=20-2

= 18 (m)

Answer: 18m.

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