1. 0,9 × 1 2/5 ÷ 14%
= 9/10 × 7/5 × 14/100
= 9/10 × 7/5 × 7/20
= 9/10 × 7/5 × 20/7
= 9 × 7 × 20/10 × 5 × 7
= 63 × 20/50 × 7
= 1.260/350
= 18/5
= 3 3/5
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1. 0,9 × 1 2/5 ÷ 14%
= 9/10 × 7/5 × 14/100
= 9/10 × 7/5 × 7/20
= 9/10 × 7/5 × 20/7
= 9 × 7 × 20/10 × 5 × 7
= 63 × 20/50 × 7
= 1.260/350
= 18/5
= 3 3/5