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The title of Huanggang in the second volume of fifth grade mathematics is very simple! ! ! Master, coming!
2 4500 divided by 1000000

3 1000000 times 4500

4 4500 divided by 0.45%

5 170 divided by 85%

6 108 divided by 18%

1 100% minus 75%=25%.

400 divided by 25%= 1600 (m)

1600-400= 1200 (m)

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