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= 10/3 × 5/2
= 50/5
=10
⑷ 40/100 × 200
= 40/1 × 2
= 80
⑽ 9/2 × 4/7 : 3/5
= 36/14 : 3/5
= 36/14 × 5/3
= 180/42
= 4 12/42