1-1/2x｛1-1/3x[1-1/4x（1-1/5)]
=1-1/2x[1-1/3x（1-1/4x4/5）]
=1-1/2x（1-1/3X4/5）
=1-1/2X11/15
=1-11/30
=19/30
1-1/2x｛1-1/3x[1-1/4x（1-1/5)]}（需要过程,简便计算）
3个回答
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