1.) 1 3/4 ÷ 1 7/8 × 5/14
= 7/4 × 15/8 × 5/14
= (7/4 × 8/15) × 5/14
= (7 × 8/4 × 15) × 5/14
= 56/60 × 5/14
= 14/15 × 5/14
= 14 × 5/15 × 14
= 70 ÷ 70/210 ÷ 70
= 1/3
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1.) 1 3/4 ÷ 1 7/8 × 5/14
= 7/4 × 15/8 × 5/14
= (7/4 × 8/15) × 5/14
= (7 × 8/4 × 15) × 5/14
= 56/60 × 5/14
= 14/15 × 5/14
= 14 × 5/15 × 14
= 70 ÷ 70/210 ÷ 70
= 1/3