1 - 2/7 × 2,1 : 2 4/5
= 1 - 2/7 × 21/10 : 14/5
= 1 - 2/7 × 21/10 × 5/14
= 1 - (2 × 21 × 5)/(7 × 10 × 14)
= 1 - 210/980
= 1 - 3/14
= 14/14 - 3/14
= 11/14
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1 - 2/7 × 2,1 : 2 4/5
= 1 - 2/7 × 21/10 : 14/5
= 1 - 2/7 × 21/10 × 5/14
= 1 - (2 × 21 × 5)/(7 × 10 × 14)
= 1 - 210/980
= 1 - 3/14
= 14/14 - 3/14
= 11/14