26*28(1/26*27+1/27*28)
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解决时间 2021-03-25 02:18
- 提问者网友:我是女神我骄傲
- 2021-03-24 01:59
26*28(1/26*27+1/27*28)
最佳答案
- 五星知识达人网友:天凉才是好个秋
- 2021-03-24 03:12
26×28×(1/26×27+1/27×28)
=26×28×1/26×27+26×27×1/27×28
=28/27+26/28
=(27-1)/27+(28-2)/28
=1-1/27+1-2/28
=1+1-(1/27+2/28)
=2-(1/27+1/14)
=2-(14/378+27/378)
=2-41/378
=1又337/378
=26×28×1/26×27+26×27×1/27×28
=28/27+26/28
=(27-1)/27+(28-2)/28
=1-1/27+1-2/28
=1+1-(1/27+2/28)
=2-(1/27+1/14)
=2-(14/378+27/378)
=2-41/378
=1又337/378
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