1) 1 дм = 100 мм
10дм : 5 мм = 1000 : 5 = 200 : 1
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2) 5/6 : 7/8 = 5/6 · 8/7 = (5·4)/(3·7) = 20/21 = 20 : 21
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1) 1 дм = 100 мм
10дм : 5 мм = 1000 : 5 = 200 : 1
- - - - - - - - - - - - - - -
2) 5/6 : 7/8 = 5/6 · 8/7 = (5·4)/(3·7) = 20/21 = 20 : 21