19\50×3 3\5+38简便运算
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19\50×3 3\5+38简便运算
19\50×3 3\5+38简便运算
19\50×3 3\5+38简便运算
19 / 50 × 3
= (19 × 3)/ 50
= (20 - 1)× 3 / 50
= (20 × 3 - 1 × 3)/ 50
= (60 - 3)/ 50
= 57 / 50
3 / 5 + 38
= 3 / 5 + 40 - 2
= 3 / 5 + 200 / 5 - 10 / 5
= (200 - 10 + 3)/ 5
= 193 / 5