6.38ⅹ5.3+6.38ⅹ5.7-6.38怎样简便算法?
2个回答
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解:6.38ⅹ5.3+6.38ⅹ5.7-6.38等于( 319/5 ),【即等于63.8】
∵已知需求出6.38ⅹ5.3+6.38ⅹ5.7-6.38等于多少
A × B + A × C = A × (B + C)
∴6.38 ⅹ 5.3 + 6.38 ⅹ 5.7 - 6.38
= 6.38 × (5.3 + 5.7 - 1)
= (6×100+38)/100 × (11 - 1)
= 638/100 × 10
= 319/50 × 10
= 319/5
= 63.8
答:6.38ⅹ5.3+6.38ⅹ5.7-6.38等于319/5,【即等于63.8】
∵已知需求出6.38ⅹ5.3+6.38ⅹ5.7-6.38等于多少
A × B + A × C = A × (B + C)
∴6.38 ⅹ 5.3 + 6.38 ⅹ 5.7 - 6.38
= 6.38 × (5.3 + 5.7 - 1)
= (6×100+38)/100 × (11 - 1)
= 638/100 × 10
= 319/50 × 10
= 319/5
= 63.8
答:6.38ⅹ5.3+6.38ⅹ5.7-6.38等于319/5,【即等于63.8】
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