1 6*4014+9*4016+1/2 / 3*4014+3
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/08/18 22:51:10
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1 6*4014+9*4016+1/2 / 3*4014+3*6024+1/4 =?要求简便计算
2(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8+.+(1-1/8)*1/8=?要求简便计算
![1 6*4014+9*4016+1/2 / 3*4014+3](/uploads/image/z/19870114-58-4.jpg?t=1%26nbsp%3B+%26nbsp%3B6%2A4014%2B9%2A4016%2B1%2F2%26nbsp%3B+%2F%26nbsp%3B+%26nbsp%3B3%2A4014%2B3)
1 6*4014+9*4016+1/2 / 3*4014+3*6024+1/4
=(12×2007+18×2008+1/2)/(6×2007+9×2008+1/4)
=2
2(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8+.+(1-1/8)*1/8
=(49+16+43+……+1)×1/8-1/8×17 (共17项,(49-1)÷3+1=17)
=(49+1)×17÷2×1/8-1/8×17
=﹙25×17-17﹚×1/8
=24×17×1/8
=3×17
=51
=(12×2007+18×2008+1/2)/(6×2007+9×2008+1/4)
=2
2(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8+.+(1-1/8)*1/8
=(49+16+43+……+1)×1/8-1/8×17 (共17项,(49-1)÷3+1=17)
=(49+1)×17÷2×1/8-1/8×17
=﹙25×17-17﹚×1/8
=24×17×1/8
=3×17
=51