7.2X0.41十0.72X4.2十0.072X17简便方法怎么算?
2个回答
展开全部
解:7.2X0.41十0.72X4.2十0.072X17等于( 36/5 ),【即等于7.2】
∵已知需求出7.2X0.41十0.72X4.2十0.072X17等于多少
A × B + A × C = A × (B + C)
∴7.2 X 0.41 十 0.72 X 4.2 十 0.072 X 17
= 0.072 × (100 × 0.41 + 10 × 4.2 + 17)
= 72/1000 × (41 + 42 + 17)
= 9/125 × (83 + 17)
= 9/125 × 100
= 36/5
= 7.2
答:7.2X0.41十0.72X4.2十0.072X17等于36/5,【即等于7.2】
∵已知需求出7.2X0.41十0.72X4.2十0.072X17等于多少
A × B + A × C = A × (B + C)
∴7.2 X 0.41 十 0.72 X 4.2 十 0.072 X 17
= 0.072 × (100 × 0.41 + 10 × 4.2 + 17)
= 72/1000 × (41 + 42 + 17)
= 9/125 × (83 + 17)
= 9/125 × 100
= 36/5
= 7.2
答:7.2X0.41十0.72X4.2十0.072X17等于36/5,【即等于7.2】
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询