用简便方法计算(小学五年级)

2022-03-18 教育 78阅读
1/1x2-1/2x3-1/3x4-1/4x5-1/5x6-1/6x7-1/7x8
=1-1/2-(1/2-1/3)-(1/3-1/4)-(1/4-1/5)-(1/5-1/6)-(1/6-1/7)-(1/7-1/8)
=1-1/2-1/2+1/3-1/3+1/4-1/4+1/5-1/5+1/6-1/6+1/7-1/7+1/8
=1/8
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