0.9+0.99+0.999+0.9999+0.99999的简便算法
2013-07-01
展开全部
0.9+0.99+0.999+0.9999+0.99999
=0.9*5+0.09*4+0.009*3+0.0009*2+0.00009
=4.5+0.36+0.027+0.0018+0.00009
=4.88889
=0.9*5+0.09*4+0.009*3+0.0009*2+0.00009
=4.5+0.36+0.027+0.0018+0.00009
=4.88889
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